diff --git a/data/uking_functions.csv b/data/uking_functions.csv
index 1c42ba29..8da4fc34 100644
--- a/data/uking_functions.csv
+++ b/data/uking_functions.csv
@@ -37218,14 +37218,14 @@
 0x0000007100615afc,AI_Behavior_AcceptLSwordDamageDCCallback::dtorDelete,96,
 0x0000007100615b5c,AI_Behavior_AcceptLSwordDamageDCCallback::rtti1,288,
 0x0000007100615c7c,AI_Behavior_AcceptLSwordDamageDCCallback::rtti2,92,
-0x0000007100615cd8,AI_BehaviorBase::m4,8,_ZN4ksys3act2ai8Behavior2m4Ev
-0x0000007100615ce0,AI_BehaviorBase::m5,8,_ZN4ksys3act2ai8Behavior2m5Ev
+0x0000007100615cd8,AI_BehaviorBase::m4,8,_ZN4ksys3act2ai8Behavior14hasPreDeleteCbEv
+0x0000007100615ce0,AI_BehaviorBase::m5,8,_ZN4ksys3act2ai8Behavior23hasUpdateForPreDeleteCbEv
 0x0000007100615ce8,AI_BehaviorBase::m11_null,4,_ZN4ksys3act2ai8Behavior3m11Ev
-0x0000007100615cec,AI_BehaviorBase::m12,8,_ZN4ksys3act2ai8Behavior3m12Ev
-0x0000007100615cf4,AI_BehaviorBase::m13_null,4,_ZN4ksys3act2ai8Behavior3m13Ev
+0x0000007100615cec,AI_BehaviorBase::m12,8,_ZN4ksys3act2ai8Behavior18updateForPreDeleteEv
+0x0000007100615cf4,AI_BehaviorBase::m13_null,4,_ZN4ksys3act2ai8Behavior11onPreDeleteEv
 0x0000007100615cf8,AI_Behavior_AcceptLSwordDamageDCCallback::m14,8,
 0x0000007100615d00,sub_7100615D00,140,
-0x0000007100615d8c,sub_7100615D8C,140,
+0x0000007100615d8c,sub_7100615D8C,140,_ZNK4sead15RuntimeTypeInfo6DeriveIN4ksys3act2ai8BehaviorEE9isDerivedEPKNS0_9InterfaceE
 0x0000007100615e18,AI_Behavior_ActorFlagSetterAttensionNotice::ctor,52,
 0x0000007100615e4c,AI_Behavior_ActorFlagSetterAttensionNotice::dtor_null,4,
 0x0000007100615e50,j__ZdlPv_139,4,
@@ -73145,13 +73145,13 @@
 0x0000007100d24e54,AI_BehaviorBase::m1,92,_ZNK4ksys3act2ai8Behavior18getRuntimeTypeInfoEv
 0x0000007100d24eb0,AI_BehaviorBase::dtorDelete,4,_ZN4ksys3act2ai8BehaviorD0Ev
 0x0000007100d24eb4,AI_BehaviorBase::m8_null,4,_ZN4ksys3act2ai8Behavior2m8Ev
-0x0000007100d24eb8,ai::Behaviors::ctor,28,
-0x0000007100d24ed4,sub_7100D24ED4,4,
-0x0000007100d24ed8,sub_7100D24ED8,200,
-0x0000007100d24fa0,ai::Behaviors::init,1212,
-0x0000007100d2545c,sub_7100D2545C,32,
-0x0000007100d2547c,sub_7100D2547C,96,
-0x0000007100d254dc,sub_7100D254DC,68,
+0x0000007100d24eb8,ai::Behaviors::ctor,28,_ZN4ksys3act2ai9BehaviorsC1Ev
+0x0000007100d24ed4,sub_7100D24ED4,4,_ZN4ksys3act2ai9BehaviorsD1Ev
+0x0000007100d24ed8,sub_7100D24ED8,200,_ZN4ksys3act2ai9Behaviors8finalizeEv
+0x0000007100d24fa0,ai::Behaviors::init,1212,_ZN4ksys3act2ai9Behaviors4initEPNS0_5ActorEPN4sead4HeapE
+0x0000007100d2545c,sub_7100D2545C,32,_ZN4ksys3act2ai9Behaviors12setFactoriesEiPNS1_15BehaviorFactoryE
+0x0000007100d2547c,sub_7100D2547C,96,_ZNK4ksys3act2ai9Behaviors18updateForPreDeleteEv
+0x0000007100d254dc,sub_7100D254DC,68,_ZNK4ksys3act2ai9Behaviors11onPreDeleteEv
 0x0000007100d25520,sub_7100D25520,100,
 0x0000007100d25584,sub_7100D25584,108,
 0x0000007100d255f0,ActorDebug::createInstance,136,
@@ -74337,10 +74337,10 @@
 0x0000007100d66d64,ai::ActorAI::rtti2,92,_ZNK4ksys3act2ai6RootAi18getRuntimeTypeInfoEv
 0x0000007100d66dc0,ai::ActorAI::m6,8,_ZNK4ksys3act2ai6RootAi10isFlag4SetEv
 0x0000007100d66dc8,sub_7100D66DC8,160,
-0x0000007100d66e68,AI_BehaviorDummy::ctor,48,
-0x0000007100d66e98,AI_BehaviorDummy::rtti1,204,
-0x0000007100d66f64,AI_BehaviorDummy::rtti2,92,
-0x0000007100d66fc0,j__ZdlPv_856,4,
+0x0000007100d66e68,AI_BehaviorDummy::ctor,48,_ZN4ksys3act2ai13DummyBehaviorC1ERKNS1_8Behavior7InitArgE
+0x0000007100d66e98,AI_BehaviorDummy::rtti1,204,_ZNK4ksys3act2ai13DummyBehavior27checkDerivedRuntimeTypeInfoEPKN4sead15RuntimeTypeInfo9InterfaceE
+0x0000007100d66f64,AI_BehaviorDummy::rtti2,92,_ZNK4ksys3act2ai13DummyBehavior18getRuntimeTypeInfoEv
+0x0000007100d66fc0,j__ZdlPv_856,4,_ZN4ksys3act2ai13DummyBehaviorD0Ev
 0x0000007100d66fc4,AI_Behavior_ShowConstStringBoard::ctor,240,
 0x0000007100d670b4,AI_Behavior_ShowConstStringBoard::m8,4,
 0x0000007100d670b8,AI_Behavior_ShowConstStringBoard::m7,284,
diff --git a/src/KingSystem/ActorSystem/CMakeLists.txt b/src/KingSystem/ActorSystem/CMakeLists.txt
index ba1bddb1..ac059bc1 100644
--- a/src/KingSystem/ActorSystem/CMakeLists.txt
+++ b/src/KingSystem/ActorSystem/CMakeLists.txt
@@ -68,4 +68,6 @@ target_sources(uking PRIVATE
   actionDummyAction.h
   aiDummyAi.cpp
   aiDummyAi.h
+  behaviorDummyBehavior.cpp
+  behaviorDummyBehavior.h
 )
diff --git a/src/KingSystem/ActorSystem/actAiActionBase.cpp b/src/KingSystem/ActorSystem/actAiActionBase.cpp
index 6de513f2..b169813c 100644
--- a/src/KingSystem/ActorSystem/actAiActionBase.cpp
+++ b/src/KingSystem/ActorSystem/actAiActionBase.cpp
@@ -1,10 +1,10 @@
 #include "KingSystem/ActorSystem/actAiActionBase.h"
+#include "KingSystem/ActorSystem/actActor.h"
 #include "KingSystem/ActorSystem/actActorParam.h"
 #include "KingSystem/ActorSystem/actAiAction.h"
 #include "KingSystem/ActorSystem/actAiRoot.h"
 #include "KingSystem/Resource/resResourceAIProgram.h"
 #include "KingSystem/Utils/InitTimeInfo.h"
-#include "KingSystem/ActorSystem/actActor.h"
 
 namespace ksys::act::ai {
 
@@ -119,7 +119,7 @@ void ActionBase::updateBehaviorsOnEnter() {
 
     auto* root = mActor->getRootAi();
     for (auto indice : *indices)
-        root->setBehavior(root->getBehaviors().classes[indice]);
+        root->setBehavior(root->getBehaviors().getClasses()[indice]);
 }
 
 bool ActionBase::takeOver(ActionBase* src, const sead::SafeString& context) {
@@ -200,7 +200,7 @@ void ActionBase::updateBehaviorsOnLeave() {
 
     auto* root = mActor->getRootAi();
     for (auto indice : *indices)
-        root->resetBehavior(root->getBehaviors().classes[indice]);
+        root->resetBehavior(root->getBehaviors().getClasses()[indice]);
 }
 
 bool ActionBase::oneShot(InlineParamPack* params) {
diff --git a/src/KingSystem/ActorSystem/actAiBehavior.cpp b/src/KingSystem/ActorSystem/actAiBehavior.cpp
index e60780fe..28781e3c 100644
--- a/src/KingSystem/ActorSystem/actAiBehavior.cpp
+++ b/src/KingSystem/ActorSystem/actAiBehavior.cpp
@@ -1,9 +1,137 @@
 #include "KingSystem/ActorSystem/actAiBehavior.h"
+#include "KingSystem/ActorSystem/actActor.h"
+#include "KingSystem/ActorSystem/actActorParam.h"
 #include "KingSystem/ActorSystem/actAiRoot.h"
+#include "KingSystem/ActorSystem/behaviorDummyBehavior.h"
+#include "KingSystem/Resource/resResourceAIProgram.h"
 
 namespace ksys::act::ai {
 
 Behavior::Behavior(const InitArg& arg)
     : mActor(arg.actor), mDefIdx(static_cast<u16>(arg.def_idx)) {}
 
+Behaviors::Behaviors() = default;
+
+Behaviors::~Behaviors() {
+    finalize();
+}
+
+void Behaviors::finalize() {
+    for (s32 i = 0; i < mClasses.size(); ++i) {
+        if (mClasses[i]) {
+            delete mClasses[i];
+            mClasses[i] = nullptr;
+        }
+    }
+
+    mOnPreDeleteCbs.freeBuffer();
+    mUpdateForPreDeleteCbs.freeBuffer();
+    mClasses.freeBuffer();
+}
+
+bool Behaviors::init(Actor* actor, sead::Heap* heap) {
+    const auto* aiprog = actor->getParam()->getRes().mAIProgram;
+
+    const auto num_behaviors = aiprog->getBehaviors().size();
+    if (num_behaviors == 0)
+        return true;
+
+    if (!mClasses.tryAllocBuffer(num_behaviors, heap))
+        return false;
+    for (s32 i = 0, n = mClasses.size(); i != n; ++i)
+        mClasses(i) = nullptr;
+    auto it_class = mClasses.begin();
+    const auto it_class_end = mClasses.end();
+
+    Behavior::InitArg arg;
+    arg.actor = actor;
+    s32 predelete_cb_num = 0;
+    s32 update_cb_num = 0;
+    for (; it_class != it_class_end; ++it_class) {
+        arg.def_idx = it_class.getIndex();
+        const char* name = aiprog->getBehaviors()[it_class.getIndex()].mClassName;
+
+        auto* factory = getFactory(name);
+        if (factory)
+            *it_class = factory->create_fn(arg, heap);
+        else
+            *it_class = new (heap) DummyBehavior(arg);
+
+        if (!*it_class)
+            return false;
+
+        update_cb_num += (*it_class)->hasUpdateForPreDeleteCb();
+        predelete_cb_num += (*it_class)->hasPreDeleteCb();
+    }
+
+    // Allocate the callback lists.
+    if (predelete_cb_num != 0) {
+        if (!mOnPreDeleteCbs.tryAllocBuffer(predelete_cb_num, heap))
+            return false;
+        for (s32 i = 0; i < predelete_cb_num; ++i)
+            mOnPreDeleteCbs(i) = nullptr;
+    }
+
+    if (update_cb_num != 0) {
+        if (!mUpdateForPreDeleteCbs.tryAllocBuffer(update_cb_num, heap))
+            return false;
+        for (s32 i = 0; i < update_cb_num; ++i)
+            mUpdateForPreDeleteCbs(i) = nullptr;
+    }
+
+    // Initialize each class.
+    s32 idx_cb1 = 0, idx_cb2 = 0;
+    for (auto it = mClasses.begin(), end = mClasses.end(); it != end; ++it) {
+        if (!(*it)->init(heap))
+            return false;
+
+        if ((*it)->hasUpdateForPreDeleteCb()) {
+            mUpdateForPreDeleteCbs[idx_cb2] = *it;
+            ++idx_cb2;
+        }
+
+        if ((*it)->hasPreDeleteCb()) {
+            mOnPreDeleteCbs[idx_cb1] = *it;
+            ++idx_cb1;
+        }
+    }
+
+    return true;
+}
+
+bool Behaviors::updateForPreDelete() const {
+    bool ok = true;
+    for (auto* cb : mUpdateForPreDeleteCbs) {
+        if (cb)
+            ok &= cb->updateForPreDelete();
+    }
+    return ok;
+}
+
+void Behaviors::onPreDelete() const {
+    for (auto* cb : mOnPreDeleteCbs) {
+        if (cb)
+            cb->onPreDelete();
+    }
+}
+
+BehaviorFactory* Behaviors::getFactory(const sead::SafeString& name) {
+    const u32 name_hash = sead::HashCRC32::calcStringHash(name);
+    const s32 idx = sFactories.binarySearch(
+        name_hash, +[](const BehaviorFactory& factory, const u32& hash) {
+            if (factory.hash < hash)
+                return -1;
+            if (factory.hash > hash)
+                return 1;
+            return 0;
+        });
+    if (idx < 0)
+        return nullptr;
+    return sFactories.get(idx);
+}
+
+void Behaviors::setFactories(int count, BehaviorFactory* factories) {
+    sFactories.setBuffer(count, factories);
+}
+
 }  // namespace ksys::act::ai
diff --git a/src/KingSystem/ActorSystem/actAiBehavior.h b/src/KingSystem/ActorSystem/actAiBehavior.h
index 993556ca..51d2ea93 100644
--- a/src/KingSystem/ActorSystem/actAiBehavior.h
+++ b/src/KingSystem/ActorSystem/actAiBehavior.h
@@ -3,6 +3,7 @@
 #include <basis/seadTypes.h>
 #include <container/seadBuffer.h>
 #include <prim/seadRuntimeTypeInfo.h>
+#include <prim/seadSafeString.h>
 #include "KingSystem/Utils/Types.h"
 
 namespace ksys::act {
@@ -25,16 +26,18 @@ public:
     explicit Behavior(const InitArg& arg);
     virtual ~Behavior() = default;
 
-    virtual bool m4() { return false; }
-    virtual bool m5() { return false; }
+    bool init(sead::Heap* heap);
+
+    virtual bool hasPreDeleteCb() { return false; }
+    virtual bool hasUpdateForPreDeleteCb() { return false; }
     virtual bool m6() { return true; }
     virtual void m7() {}
     virtual void m8() {}
     virtual void m9() {}
     virtual void m10() {}
     virtual void m11() {}
-    virtual bool m12() { return true; }
-    virtual void m13() {}
+    virtual bool updateForPreDelete() { return true; }
+    virtual void onPreDelete() {}
 
 protected:
     Actor* mActor{};
@@ -46,6 +49,12 @@ protected:
 };
 KSYS_CHECK_SIZE_NX150(Behavior, 0x28);
 
+struct BehaviorFactory {
+    using CreateFn = Behavior* (*)(const Behavior::InitArg& arg, sead::Heap* heap);
+    u32 hash;
+    CreateFn create_fn;
+};
+
 class Behaviors {
 public:
     Behaviors();
@@ -53,11 +62,22 @@ public:
 
     void finalize();
 
-    sead::Buffer<Behavior*> classes;
-    // TODO: rename
-    sead::Buffer<Behavior*> x;
-    // TODO: rename
-    sead::Buffer<Behavior*> y;
+    bool init(Actor* actor, sead::Heap* heap);
+    bool updateForPreDelete() const;
+    void onPreDelete() const;
+
+    const sead::Buffer<Behavior*>& getClasses() const { return mClasses; }
+
+    static BehaviorFactory* getFactory(const sead::SafeString& name);
+    static void setFactories(int count, BehaviorFactory* factories);
+
+private:
+    static inline sead::Buffer<BehaviorFactory> sFactories;
+    sead::Buffer<Behavior*> mClasses;
+    // Non-owning buffer.
+    sead::Buffer<Behavior*> mOnPreDeleteCbs;
+    // Non-owning buffer.
+    sead::Buffer<Behavior*> mUpdateForPreDeleteCbs;
 };
 
 }  // namespace ksys::act::ai
diff --git a/src/KingSystem/ActorSystem/behaviorDummyBehavior.cpp b/src/KingSystem/ActorSystem/behaviorDummyBehavior.cpp
new file mode 100644
index 00000000..660461f5
--- /dev/null
+++ b/src/KingSystem/ActorSystem/behaviorDummyBehavior.cpp
@@ -0,0 +1,7 @@
+#include "KingSystem/ActorSystem/behaviorDummyBehavior.h"
+
+namespace ksys::act::ai {
+
+DummyBehavior::DummyBehavior(const Behavior::InitArg& arg) : Behavior(arg) {}
+
+}  // namespace ksys::act::ai
diff --git a/src/KingSystem/ActorSystem/behaviorDummyBehavior.h b/src/KingSystem/ActorSystem/behaviorDummyBehavior.h
new file mode 100644
index 00000000..bc160223
--- /dev/null
+++ b/src/KingSystem/ActorSystem/behaviorDummyBehavior.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include "KingSystem/ActorSystem/actAiBehavior.h"
+
+namespace ksys::act::ai {
+
+class DummyBehavior : public Behavior {
+    SEAD_RTTI_OVERRIDE(DummyBehavior, Behavior)
+public:
+    explicit DummyBehavior(const InitArg& arg);
+};
+
+}  // namespace ksys::act::ai