diff --git a/include/SSystem/SComponent/c_bg_s_gnd_chk.h b/include/SSystem/SComponent/c_bg_s_gnd_chk.h
index a102cfc3e..a4ebace1c 100644
--- a/include/SSystem/SComponent/c_bg_s_gnd_chk.h
+++ b/include/SSystem/SComponent/c_bg_s_gnd_chk.h
@@ -12,7 +12,9 @@ public:
         m_pos = *pos;
     }
     void SetPos(Vec* pos) {
-        m_pos = *pos;
+        m_pos.x = pos->x;
+        m_pos.y = pos->y;
+        m_pos.z = pos->z;
     }
 
     virtual ~cBgS_GndChk() {}
diff --git a/include/d/actor/d_a_tn.h b/include/d/actor/d_a_tn.h
index 5ec081fbd..b19eb9c1d 100644
--- a/include/d/actor/d_a_tn.h
+++ b/include/d/actor/d_a_tn.h
@@ -40,7 +40,7 @@ struct tn_class {
     /* 0x02C4 */ mDoExt_McaMorf* mpBodyMorf;
     /* 0x02C8 */ mDoExt_McaMorf* mpShieldMorf;
     /* 0x02CC */ mDoExt_McaMorf* mpArmorMorf;
-    /* 0x02D0 */ u8 mRemainingEquipmentPieces;
+    /* 0x02D0 */ s8 mRemainingEquipmentPieces;
     /* 0x02D1 */ u8 m02D1[0x02D4 - 0x02D1];
     /* 0x02D4 */ u32 mShadowId;
     /* 0x02D8 */ mDoExt_brkAnm* mpBrkAnm;
diff --git a/include/d/d_cc_uty.h b/include/d/d_cc_uty.h
index dd96413e3..a1891019e 100644
--- a/include/d/d_cc_uty.h
+++ b/include/d/d_cc_uty.h
@@ -29,6 +29,8 @@ void def_se_set_p(fopAc_ac_c*, cXyz*, cCcD_Obj*, unsigned long);
 fopAc_ac_c* at_power_check(CcAtInfo*);
 fopAc_ac_c* cc_at_check(fopAc_ac_c*, CcAtInfo*);
 
-inline void dCc_GetAc(void*) {}
+inline fopAc_ac_c* dCc_GetAc(void* i_actor) {
+    return static_cast<fopAc_ac_c*>(i_actor);
+}
 
 #endif /* D_CC_UTY_H */
diff --git a/include/d/d_path.h b/include/d/d_path.h
index c791a10b4..9c83e611d 100644
--- a/include/d/d_path.h
+++ b/include/d/d_path.h
@@ -22,7 +22,7 @@ struct dPath {
     /* 0x08 */ dPnt* m_points;
 };
 
-inline BOOL dPath_ChkClose(dPath* i_path) { return i_path->m_closed & 1; }
+inline BOOL dPath_ChkClose(dPath* i_path) { return (i_path->m_closed & 1) != 0; }
 
 dPath* dPath_GetRoomPath(int, int);
 dPath* dPath_GetNextRoomPath(dPath*, int);
diff --git a/include/f_op/f_op_actor_mng.h b/include/f_op/f_op_actor_mng.h
index 8462ecf90..c01a4479c 100644
--- a/include/f_op/f_op_actor_mng.h
+++ b/include/f_op/f_op_actor_mng.h
@@ -127,7 +127,7 @@ inline MtxP fopAcM_GetMtx(fopAc_ac_c* pActor) {
     return pActor->cullMtx;
 }
 
-inline bool fopAcM_CheckStatus(fopAc_ac_c* pActor, u32 status) {
+inline u32 fopAcM_CheckStatus(fopAc_ac_c* pActor, u32 status) {
     return pActor->actor_status & status;
 }
 
@@ -155,8 +155,8 @@ inline void fopAcM_SetParam(void* p_actor, u32 param) {
     fpcM_SetParam(p_actor, param);
 }
 
-inline void fopAcM_SetJntHit(fopAc_ac_c* i_actorP, JntHit_c* i_jntHitP) {
-    i_actorP->jntHit = i_jntHitP;
+inline void fopAcM_SetJntHit(fopAc_ac_c* i_actorP, void* i_jntHitP) {
+    i_actorP->jntHit = (JntHit_c*)i_jntHitP;
 }
 
 inline s16 fopAcM_GetProfName(void* pActor) {
@@ -475,12 +475,8 @@ fpc_ProcID fopAcM_create(char*, u32 i_parameter, cXyz* i_pos = NULL, int i_roomN
                    csXyz* i_angle = NULL, cXyz* i_scale = NULL,
                    createFunc i_createFunc = NULL);
 
-inline fpc_ProcID fopAcM_create(s16 i_procName, createFunc i_createFunc, void* params) {
-    return fpcM_Create(i_procName, i_createFunc, params);
-}
-
 inline fpc_ProcID fopAcM_Create(s16 i_procName, createFunc i_createFunc, void* params) {
-    return fpcM_Create(i_procName, i_createFunc,params);
+    return fpcM_Create(i_procName, i_createFunc, params);
 }
 
 void* fopAcM_fastCreate(s16 procName, u32 parameter, cXyz* p_pos = NULL, int roomNo = -1,
diff --git a/src/d/actor/d_a_bmd.cpp b/src/d/actor/d_a_bmd.cpp
index 41d8e09b6..4debad561 100644
--- a/src/d/actor/d_a_bmd.cpp
+++ b/src/d/actor/d_a_bmd.cpp
@@ -1993,12 +1993,12 @@ static cPhs_State daBmd_Create(fopAc_ac_c* a_this) {
         for (s32 i = 0; i < 20; i++) {
             fopAcM_prm_class* params = fopAcM_CreateAppend();
             params->base.parameters = i;
-            fopAcM_create(fpcNm_BMDHAND_e, 0, params);
+            fopAcM_Create(fpcNm_BMDHAND_e, NULL, params);
         }
         for (s32 i = 0; i < 8; i++) {
             fopAcM_prm_class* params = fopAcM_CreateAppend();
             params->base.parameters = i;
-            fopAcM_create(fpcNm_BMDFOOT_e, 0, params);
+            fopAcM_Create(fpcNm_BMDFOOT_e, NULL, params);
         }
         a_this->home.pos.y += REG0_F(2) + 20.0f;
         a_this->current.pos.y = a_this->home.pos.y;
diff --git a/src/d/actor/d_a_ff.cpp b/src/d/actor/d_a_ff.cpp
index 2a4e4609d..9ceffa234 100644
--- a/src/d/actor/d_a_ff.cpp
+++ b/src/d/actor/d_a_ff.cpp
@@ -304,7 +304,7 @@ static cPhs_State daFf_Create(fopAc_ac_c* i_this) {
                     pfVar4->base.angle.y = 0;
                     pfVar4->base.angle.x = 0;
                     pfVar4->base.parameters = fopAcM_GetParam(a_this);
-                    fopAcM_create(fpcNm_FF_e, NULL, pfVar4);
+                    fopAcM_Create(fpcNm_FF_e, NULL, pfVar4);
                 }
             }
             a_this->mbNoUseGroundY = fopAcM_GetParam(a_this) >> 8;
diff --git a/src/d/actor/d_a_kokiie.cpp b/src/d/actor/d_a_kokiie.cpp
index c5d3df5d5..5398ac1b4 100644
--- a/src/d/actor/d_a_kokiie.cpp
+++ b/src/d/actor/d_a_kokiie.cpp
@@ -187,7 +187,7 @@ BOOL himo_create(kokiie_class* i_this) {
             pfVar3->base.angle.y = actor->current.angle.y + i * 0x3333 + -13000;
             pfVar3->base.parameters = 0xffffff01;
             pfVar3->room_no = actor->current.roomNo;
-            i_this->m2D4[i] = fopAcM_create(fpcNm_SHAND_e, NULL, pfVar3);
+            i_this->m2D4[i] = fopAcM_Create(fpcNm_SHAND_e, NULL, pfVar3);
             i_this->m2E8[i]++;
 
         case 1:
diff --git a/src/d/actor/d_a_mo2.cpp b/src/d/actor/d_a_mo2.cpp
index 08a62cb0d..3d4f1348b 100644
--- a/src/d/actor/d_a_mo2.cpp
+++ b/src/d/actor/d_a_mo2.cpp
@@ -1794,7 +1794,7 @@ static fopAc_ac_c* yari_hit_check(mo2_class* i_this) {
             } else {
                 pcVar2 = i_this->mWeapon2Sph.GetAtHitObj();
             }
-            return pcVar2->GetAc();
+            return dCc_GetAc(pcVar2->GetAc());
         }
     }
     return NULL;
@@ -1809,7 +1809,7 @@ static void AtHitCallback(fopAc_ac_c* a_this, dCcD_GObjInf*, fopAc_ac_c* actor,
     if (fopAcM_GetName(actor) != fpcNm_PLAYER_e) {
         return;
     }
-    if (!daPy_getPlayerActorClass()->checkGrabWear()) {
+    if (!((daPy_py_c*)dComIfGp_getPlayer(0))->checkGrabWear()) {
         return;
     }
     i_this->m2A48 = 1;
@@ -1833,7 +1833,7 @@ static void fight(mo2_class* i_this) {
             i_this->mDamageReaction.mMode = 1;
             i_this->m05A4[2] = 8;
             // Fall-through
-        case 1:
+        case 1: {
             i_this->mWeaponSph.SetAtAtp(mo2_attack_AP[i_this->m2060]);
             i_this->mWeapon2Sph.SetAtAtp(mo2_attack_AP[i_this->m2060]);
             attack_info_s* info = attack_info[i_this->m2060];
@@ -1907,7 +1907,7 @@ static void fight(mo2_class* i_this) {
             fopAc_ac_c* hitActor = yari_hit_check(i_this);
             if (hitActor != NULL) {
                 if (fopAcM_GetName(hitActor) == fpcNm_PLAYER_e) {
-                    if (player->checkPlayerGuard() && (i_this->m2060 != 3)) {
+                    if (player->checkPlayerGuard() && i_this->m2060 != 3) {
                         i_this->mpMorf->setPlaySpeed(-1.0f);
                         if (i_this->m05F0 != 0) {
                             i_this->m05F0 = l_mo2HIO.m024 + 6;
@@ -1944,9 +1944,10 @@ static void fight(mo2_class* i_this) {
                 }
             }
             if (i_this->mpMorf->isStop()) {
-                if (((((i_this->m2064 == 2) && (i_this->m207E > 0)) || (i_this->m2060 == 4 && (i_this->m2064 == 0))) ||
-                     (i_this->m207E < 0 && (i_this->m2064 == 0))) ||
-                    (i_this->m2060 == 5 && (i_this->m207E < 0 && (i_this->m2064 == 1))))
+                if ((i_this->m2064 == 2 && i_this->m207E > 0) ||
+                    (i_this->m2060 == 4 && i_this->m2064 == 0) ||
+                    (i_this->m207E < 0 && i_this->m2064 == 0) ||
+                    (i_this->m2060 == 5 && i_this->m207E < 0 && i_this->m2064 == 1))
                 {
                     if (i_this->m2060 == 3) {
                         attack_set(i_this, 1);
@@ -1995,6 +1996,7 @@ static void fight(mo2_class* i_this) {
                     anm_init(i_this, info[i_this->m2064].bckFileIdx, 0.0f, J3DFrameCtrl::EMode_NONE, fVar11, info[i_this->m2064].soundFileIdx);
                 }
             }
+        }
     }
 }
 
@@ -3345,7 +3347,7 @@ static s32 kantera_get_init(mo2_class* i_this) {
         params->base.angle.y = actor->current.angle.y;
         params->base.parameters = (fopAcM_GetParam(actor) & 0xFF000000U) | 0xFFFF23; // TODO clean up parameters
         params->room_no = fopAcM_GetRoomNo(actor);
-        i_this->m02E8 = fopAcM_create(fpcNm_KANTERA_e, NULL, params);
+        i_this->m02E8 = fopAcM_Create(fpcNm_KANTERA_e, NULL, params);
         i_this->m2A08++;
     } else if (i_this->m2A08 != 100) {
         kantera_class* kantera = (kantera_class*)fopAcM_SearchByID(i_this->m02E8);
@@ -3380,7 +3382,8 @@ static BOOL daMo2_Execute(mo2_class* i_this) {
         i_this->mpMorf->setPlayMode(J3DFrameCtrl::EMode_NONE);
         i_this->mpMorf->setPlaySpeed(3.0f);
         i_this->mpMorf->play(&actor->eyePos, 0, 0);
-        i_this->mpMorf->getModel()->setBaseTRMtx(mDoMtx_stack_c::now);
+        J3DModel* model = i_this->mpMorf->getModel();
+        model->setBaseTRMtx(mDoMtx_stack_c::get());
         i_this->mpMorf->calc();
         return TRUE;
     }
diff --git a/src/d/actor/d_a_player_npc.cpp b/src/d/actor/d_a_player_npc.cpp
index d0905f9f3..d7224420e 100644
--- a/src/d/actor/d_a_player_npc.cpp
+++ b/src/d/actor/d_a_player_npc.cpp
@@ -162,7 +162,11 @@ BOOL daPy_npc_c::checkNowPosMove(const char* pName) {
         return TRUE;
     }
     
-    return fopAcM_CheckStatus(this, fopAcStts_UNK800_e);
+    if (fopAcM_CheckStatus(this, fopAcStts_UNK800_e)) {
+        return TRUE;
+    }
+    
+    return FALSE;
 }
 
 /* 8015AC74-8015AD20       .text drawDamageFog__10daPy_npc_cFv */
diff --git a/src/d/actor/d_a_tn.cpp b/src/d/actor/d_a_tn.cpp
index 540961e8d..fea89e490 100644
--- a/src/d/actor/d_a_tn.cpp
+++ b/src/d/actor/d_a_tn.cpp
@@ -257,7 +257,6 @@ static void ground_smoke_set(tn_class* i_this) {
 
 /* 00001244-0000149C       .text nodeCallBack__FP7J3DNodei */
 static BOOL nodeCallBack(J3DNode* node, int calcTiming) {
-    /* Nonmatching - retail-only regalloc */
     if (calcTiming == J3DNodeCBCalcTiming_In) {
         J3DJoint* joint = (J3DJoint*)node;
         s32 jntNo = joint->getJntNo();
@@ -708,7 +707,7 @@ static fopAc_ac_c* search_bomb(tn_class* i_this, int r26) {
             sp28.y = 50.0f + r24->current.pos.y - actor->eyePos.y;
             sp28.z = r24->current.pos.z - actor->current.pos.z;
             f32 f0 = std::sqrtf(sp28.x * sp28.x + sp28.z * sp28.z);
-            if (f0 < f29 && !(f0 > 30.0f + i_this->mPlayerDistance) && !(daTn_other_bg_check(i_this, r24) && r26)) {
+            if (f0 < f29 && !(f0 > 30.0f + i_this->mPlayerDistance) && (!daTn_other_bg_check(i_this, r24) || !r26)) {
                 if (r26) {
                     if (std::fabsf(r24->current.pos.y + 50.0f - actor->eyePos.y) <= l_tnHIO.m038) {
                         s16 angleDiff = i_this->m0414 - cM_atan2s(sp28.x, sp28.z);
@@ -1074,7 +1073,7 @@ static void jyunkai(tn_class* i_this) {
             break;
     }
     s32 r3 = fopAcM_otoCheck(actor, 1000.0f);
-    if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+    if (i_this->mMantPcId != 0xFFFF) {
         mant_class* mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
         if ((mant_actor != NULL) && (mant_actor->m1C0E != 0)) {
             r3 |= 2;
@@ -1376,11 +1375,11 @@ static fopAc_ac_c* wepon_hit_check(tn_class* i_this) {
     i_this->mWepon2Sph.SetAtAtp(atp);
     if (i_this->m0C48 == 3) {
         MTXCopy(i_this->mpBodyMorf->getModel()->getAnmMtx(0x05), *calc_mtx);
-        local_28.setall(0.0f);
+        local_28.set(0.0f, 0.0f, 0.0f);
     } else {
         MTXCopy(i_this->mpBodyMorf->getModel()->getAnmMtx(0x17), *calc_mtx);
         if (i_this->m0C48 == 2) {
-            local_28.setall(0.0f);
+            local_28.set(0.0f, 0.0f, 0.0f);
         } else {
             local_28.set(0.0f, 0.0f, 150.0f);
         }
@@ -1419,7 +1418,7 @@ static fopAc_ac_c* wepon_hit_check(tn_class* i_this) {
                 hitObj = i_this->mWepon2Sph.GetAtHitObj();
             }
             if (hitObj != NULL) {
-                return hitObj->GetAc();
+                return dCc_GetAc(hitObj->GetAc());
             }
             JUTReport(440, 220, "TN AT HITOBJ NON");
         }
@@ -1572,8 +1571,10 @@ static void fight(tn_class* i_this) {
                 actor->setBtMaxDis(l_tnHIO.m0D4);
                 actor->setBtNowFrame(i_this->mpBodyMorf->getFrame());
                 fopAc_ac_c* wepon_hit_actor = wepon_hit_check(i_this);
-                if ((((wepon_hit_actor != NULL) && (fopAcM_GetName(wepon_hit_actor) == fpcNm_PLAYER_e)) && (player->checkPlayerGuard())) &&
-                    (i_this->m0C48 == 0 || (i_this->m0C48 == 1)))
+                if (wepon_hit_actor != NULL &&
+                    fopAcM_GetName(wepon_hit_actor) == fpcNm_PLAYER_e &&
+                    player->checkPlayerGuard() &&
+                    (i_this->m0C48 == 0 || i_this->m0C48 == 1))
                 {
                     i_this->mpBodyMorf->setPlaySpeed(-1.0f);
                     i_this->m0C66 = -1;
@@ -1670,7 +1671,7 @@ static void fight(tn_class* i_this) {
                 yoroi_anm_init(i_this, TN_BCK_YAT_KAITEN4, 1.0f, J3DFrameCtrl::EMode_NONE, 1.0f);
                 fopAcM_monsSeStart(actor, JA_SE_CV_TN_ATTACK_L, 0);
             }
-            if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+            if (i_this->mMantPcId != 0xFFFF) {
                 mant_class* mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                 if (mant_actor != NULL) {
                     cLib_addCalc2(&mant_actor->m1BF8, REG0_F(6) + 50.0f, 1.0f, 20.0f);
@@ -2189,7 +2190,7 @@ static void stand(tn_class* i_this) {
 
     i_this->mDamageReaction.m710 = 0;
     s32 r30 = fopAcM_otoCheck(actor, 1000.0f);
-    if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+    if (i_this->mMantPcId != 0xFFFF) {
         mant_class* mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
         if ((mant_actor != NULL) && (mant_actor->m1C0E != 0)) {
             r30 |= 2;
@@ -2776,19 +2777,19 @@ static void yoroi_break(tn_class* i_this, cXyz* particlePos, u8 param_3) {
     dComIfGp_particle_set(dPa_name::ID_AK_JN_SIBOUFLASH, particlePos, NULL, &particle_scale);
 
     GXColor prmColor;
-    f32 tmp = (i_this->actor.tevStr.mColorK0.r / 255.0f);
+    f32 tmp = (actor->tevStr.mColorK0.r / 255.0f);
     prmColor.r = tmp * prim[i_this->mArmorColorIndex].r;
-    tmp = (i_this->actor.tevStr.mColorK0.g / 255.0f);
+    tmp = (actor->tevStr.mColorK0.g / 255.0f);
     prmColor.g = tmp * prim[i_this->mArmorColorIndex].g;
-    tmp = (i_this->actor.tevStr.mColorK0.b / 255.0f);
+    tmp = (actor->tevStr.mColorK0.b / 255.0f);
     prmColor.b = tmp * prim[i_this->mArmorColorIndex].b;
 
     GXColor envColor;
-    tmp = (i_this->actor.tevStr.mColorK0.r / 255.0f);
+    tmp = (actor->tevStr.mColorK0.r / 255.0f);
     envColor.r = tmp * env[i_this->mArmorColorIndex].r;
-    tmp = (i_this->actor.tevStr.mColorK0.g / 255.0f);
+    tmp = (actor->tevStr.mColorK0.g / 255.0f);
     envColor.g = tmp * env[i_this->mArmorColorIndex].g;
-    tmp = (i_this->actor.tevStr.mColorK0.b / 255.0f);
+    tmp = (actor->tevStr.mColorK0.b / 255.0f);
     envColor.b = tmp * env[i_this->mArmorColorIndex].b;
 
     if (param_3 == 0) {
@@ -2807,10 +2808,9 @@ static void yoroi_break(tn_class* i_this, cXyz* particlePos, u8 param_3) {
 
 /* 00008F9C-00009E2C       .text damage_check__FP8tn_class */
 static u8 damage_check(tn_class* i_this) {
-    /* Nonmatching */
     fopAc_ac_c* actor = &i_this->actor;
-    s8 r26_2;
     s16 r3;
+    s8 r26_2;
     mant_class* mant_actor;
     csXyz local_a0;
     csXyz local_a8;
@@ -2905,12 +2905,12 @@ static u8 damage_check(tn_class* i_this) {
                 if (i_this->m0C34 != 0) {
                     i_this->m0C38 = 2;
                 }
-                if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+                if (i_this->mMantPcId != 0xFFFF) {
                     mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                     if (mant_actor != NULL) {
                         fopAcM_delete(mant_actor);
                     }
-                    i_this->mMantPcId = (u16)fpcM_ERROR_PROCESS_ID_e;
+                    i_this->mMantPcId = 0xFFFF;
                 }
                 return 0;
             }
@@ -2939,9 +2939,8 @@ static u8 damage_check(tn_class* i_this) {
                         dScnPly_ply_c::setPauseTimer(REG0_S(7) + 6);
                         fopAcM_seStart(actor, JA_SE_CM_TN_HELMET_OUT, 0);
                         cXyz* particlePos = i_this->mTgCyl.GetTgHitPosP();
-                        local_74.setall(2.0f);
-                        local_a0.z = 0;
-                        local_a0.x = 0;
+                        local_74.set(2.0f, 2.0f, 2.0f);
+                        local_a0.x = local_a0.z = 0;
                         local_a0.y = fopAcM_searchPlayerAngleY(actor);
                         dComIfGp_particle_set(dPa_name::ID_AK_JN_OK, particlePos, &local_a0, &local_74);
                         dComIfGp_particle_set(dPa_name::ID_AK_JN_CRITICALHITFLASH, particlePos);
@@ -2954,12 +2953,11 @@ static u8 damage_check(tn_class* i_this) {
                         r3 = -r3;
                     }
                     cXyz* particlePos = i_this->mTgCyl.GetTgHitPosP();
-                    local_80.setall(2.0f);
-                    local_a8.z = 0;
-                    local_a8.x = 0;
+                    local_80.set(2.0f, 2.0f, 2.0f);
+                    local_a8.x = local_a8.z = 0;
                     local_a8.y = fopAcM_searchPlayerAngleY(actor);
                     r26_2 = false;
-                    if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+                    if (i_this->mMantPcId != 0xFFFF) {
                         mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                         if ((mant_actor != NULL) && (mant_actor->m2834 != 0 || (mant_actor->m2836 != 0))) {
                             r26_2 = true;
@@ -2976,12 +2974,12 @@ static u8 damage_check(tn_class* i_this) {
                         mDoAud_bgmHitSound(atInfo.mHitSoundId);
                         dComIfGp_particle_set(dPa_name::ID_AK_JN_OK, particlePos, &local_a8, &local_80);
                         dComIfGp_particle_set(dPa_name::ID_AK_JN_CRITICALHITFLASH, particlePos);
-                        if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+                        if (i_this->mMantPcId != 0xFFFF) {
                             mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                             if (mant_actor != NULL) {
                                 fopAcM_delete(mant_actor);
                             }
-                            i_this->mMantPcId = (u16)fpcM_ERROR_PROCESS_ID_e;
+                            i_this->mMantPcId = 0xFFFF;
                         }
                         def_se_set(actor, atInfo.mpObj, 0x21);
                         fopAcM_monsSeStart(actor, JA_SE_CV_TN_NO_DAMAGE, 0);
@@ -3004,12 +3002,12 @@ static u8 damage_check(tn_class* i_this) {
                             } else {
                                 actor->health = 10;
                             }
-                            if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+                            if (i_this->mMantPcId != 0xFFFF) {
                                 mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                                 if (mant_actor != NULL) {
                                     fopAcM_delete(mant_actor);
                                 }
-                                i_this->mMantPcId = (u16)fpcM_ERROR_PROCESS_ID_e;
+                                i_this->mMantPcId = 0xFFFF;
                             }
                         }
                     }
@@ -3153,7 +3151,6 @@ static s32 j_dt[] = {0x0000000A, 0x0000001C, 0x0000000F};
 
 /* 00009E68-0000AC54       .text part_move__FP8tn_classi */
 static void part_move(tn_class* i_this, int partIndex) {
-    /* Nonmatching */
     fopAc_ac_c* actor = &i_this->actor;
     mant_class* mant_actor;
     J3DModel* model;
@@ -3167,7 +3164,7 @@ static void part_move(tn_class* i_this, int partIndex) {
     daPy_py_c* player = (daPy_py_c*)dComIfGp_getPlayer(0);
     part = &i_this->mParts[partIndex];
     dBgS_GndChk gndChk;
-    local_134.setall(0.0f);
+    local_134.set(0.0f, 0.0f, 0.0f);
     part->m42++;
     iVar12 = j_dt[partIndex];
     if (part->m44 != 0) {
@@ -3177,8 +3174,9 @@ static void part_move(tn_class* i_this, int partIndex) {
         case 0:
             MTXCopy(i_this->mpBodyMorf->getModel()->getAnmMtx(iVar12), *calc_mtx);
             MtxPosition(&local_134, &part->m0C);
-            if (((((i_this->m02DD & 1) != 0) && (partIndex == 0)) || ((i_this->m02DD & 2) != 0 && (partIndex == 1))) ||
-                ((i_this->m02DD & 4) != 0 && (partIndex == 2)))
+            if (((i_this->m02DD & 1) != 0 && partIndex == 0) ||
+                ((i_this->m02DD & 2) != 0 && partIndex == 1) ||
+                ((i_this->m02DD & 4) != 0 && partIndex == 2))
             {
                 part->m08 = 1;
                 if (partIndex == 0) {
@@ -3276,12 +3274,8 @@ static void part_move(tn_class* i_this, int partIndex) {
                     }
                     part->m44 = 0x14;
                 } else {
-                    part->m24.z = 0.0f;
-                    part->m24.y = 0.0f;
-                    part->m24.x = 0.0f;
-                    part->m36.z = 0;
-                    part->m36.y = 0;
-                    part->m36.x = 0;
+                    part->m24.x = part->m24.y = part->m24.z = 0.0f;
+                    part->m36.x = part->m36.y = part->m36.z = 0;
                     cLib_addCalcAngleS2(&part->m30.x, 0, 1, 0xc00);
                     cLib_addCalcAngleS2(&part->m30.z, 0x4000, 1, 0xc00);
                 }
@@ -3289,12 +3283,12 @@ static void part_move(tn_class* i_this, int partIndex) {
             if (part->m44 == 1) {
                 part->m08 = -1;
                 yoroi_break(i_this, &part->m0C, partIndex);
-                if ((partIndex == 0) && (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e)) {
+                if ((partIndex == 0) && (i_this->mMantPcId != 0xFFFF)) {
                     mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                     if (mant_actor != NULL) {
                         fopAcM_delete(mant_actor);
                     }
-                    i_this->mMantPcId = (u16)fpcM_ERROR_PROCESS_ID_e;
+                    i_this->mMantPcId = 0xFFFF;
                 }
             }
             break;
@@ -3331,7 +3325,7 @@ static void part_move(tn_class* i_this, int partIndex) {
     }
     if (partIndex == 0) {
         i_this->mpArmorMorf->calc();
-        if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+        if (i_this->mMantPcId != 0xFFFF) {
             mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
             if (mant_actor != NULL) {
                 MTXCopy(i_this->mpArmorMorf->getModel()->getAnmMtx(REG6_S(5) + 6), *calc_mtx);
@@ -3433,13 +3427,9 @@ static void spin_blur_set(tn_class* i_this) {
 /* 0000AEA8-0000BCE4       .text daTn_Execute__FP8tn_class */
 static BOOL daTn_Execute(tn_class* i_this) {
     /* Nonmatching - retail-only regalloc */
-    fopEn_enemy_c* actor = &i_this->actor;
+    fopEn_enemy_c* actor = (fopEn_enemy_c*)&i_this->actor;
     mant_class* mant_actor;
     daBoko_c* boko_actor;
-    cXyz local_a8;
-    cXyz cStack_b4;
-    cXyz local_c0;
-    cXyz local_cc;
 
     daPy_py_c* player = (daPy_py_c*)dComIfGp_getPlayer(0);
 #if VERSION > VERSION_DEMO
@@ -3526,7 +3516,7 @@ static BOOL daTn_Execute(tn_class* i_this) {
                     MtxTrans(-10000.0f, -10000.0f, 0.0f, false);
                     boko_actor->setMatrix(*calc_mtx);
                 }
-                if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+                if (i_this->mMantPcId != 0xFFFF) {
                     mant_actor = (mant_class*)fopAcM_SearchByID(i_this->mMantPcId);
                     if (mant_actor != NULL) {
                         mant_actor->m1BE0.x = -10000.0f;
@@ -3632,15 +3622,17 @@ static BOOL daTn_Execute(tn_class* i_this) {
     enemy_fire(&i_this->mEnemyFire);
     MtxTrans(actor->current.pos.x, actor->current.pos.y, actor->current.pos.z, false);
     cMtx_YrotM(*calc_mtx, actor->current.angle.y);
+    cXyz local_a8;
     local_a8.x = 0.0f;
     local_a8.y = 0.0f;
     local_a8.z = 35.0f;
+    cXyz cStack_b4;
     MtxPosition(&local_a8, &cStack_b4);
     i_this->mCoCyl.SetC(cStack_b4);
     dComIfG_Ccsp()->Set(&i_this->mCoCyl);
     dComIfG_Ccsp()->SetMass(&i_this->mCoCyl, 3);
-    local_c0 = i_this->m1384;
-    local_cc = actor->current.pos;
+    cXyz local_c0 = i_this->m1384;
+    cXyz local_cc = actor->current.pos;
     if (i_this->m03F0 != 0) {
         local_c0.y -= 20000.0f;
         local_cc.y -= 20000.0f;
@@ -3779,7 +3771,7 @@ static BOOL daTn_Delete(tn_class* i_this) {
         i_this->mpBodyMorf->stopZelAnime();
     }
 #endif
-    if (i_this->mMantPcId != (u16)fpcM_ERROR_PROCESS_ID_e) {
+    if (i_this->mMantPcId != 0xFFFF) {
         fopAc_ac_c* mant_actor = fopAcM_SearchByID(i_this->mMantPcId);
         if (mant_actor != NULL) {
             fopAcM_delete(mant_actor);
@@ -4239,8 +4231,7 @@ static cPhs_State daTn_Create(fopAc_ac_c* a_this) {
 #endif
     }
     i_this->mEquipmentType = (a_this->current.angle.x >> 5) & 7;
-    a_this->current.angle.z = 0;
-    a_this->current.angle.x = 0;
+    a_this->current.angle.x = a_this->current.angle.z = 0;
     if (i_this->mArmorColorIndex > 5) {
         i_this->mArmorColorIndex = 5;
     }
@@ -4342,7 +4333,7 @@ static cPhs_State daTn_Create(fopAc_ac_c* a_this) {
     i_this->m140C = 1;
     i_this->m0C34 = 1;
     if (i_this->mEquipmentType < EQUIPMENT_SHIELD_AND_CAPE) {
-        i_this->mMantPcId = (u16)fpcM_ERROR_PROCESS_ID_e;
+        i_this->mMantPcId = 0xFFFF;
     } else {
         i_this->mMantPcId = fopAcM_create(fpcNm_MANT_e, mant_class::Type_DARKNUT_e, &a_this->current.pos, fopAcM_GetRoomNo(a_this));
     }
diff --git a/src/d/d_stage.cpp b/src/d/d_stage.cpp
index 902decf0d..37d481ad6 100644
--- a/src/d/d_stage.cpp
+++ b/src/d/d_stage.cpp
@@ -1305,7 +1305,7 @@ void dStage_actorCreate(stage_actor_data_class* i_actorData, fopAcM_prm_class* i
     } else {
         i_actorPrm->argument = nameinf_p->argument;
         i_actorPrm->gbaName = nameinf_p->gbaName;
-        fopAcM_create(nameinf_p->procname, NULL, i_actorPrm);
+        fopAcM_Create(nameinf_p->procname, NULL, i_actorPrm);
     }
 }