Update

Assets/Scripts/Network/FusionClientMovementBridge.cs

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+using UnityEngine;
+using Fusion;
+using Opsive.UltimateCharacterController.Networking;
+using Opsive.UltimateCharacterController.Networking.Character;
+using Opsive.UltimateCharacterController.Character;
+using Opsive.UltimateCharacterController.Camera; // Corrected namespace
+using Opsive.UltimateCharacterController.Input; // Corrected namespace
+
+namespace Hallucinate.Network
+{
+    // Ensure Opsive components load before this
+    [DefaultExecutionOrder(100)] 
+    public class FusionClientMovementBridge : NetworkBehaviour, INetworkInfo, INetworkCharacter
+    {
+        public override void Spawned()
+        {
+            // Because we passed State Authority to the client in BasicSpawner, 
+            // HasStateAuthority is true ONLY for the local player.
+            bool isLocal = Object.HasStateAuthority;
+
+            // 1. Isolate Input: Only the local player should read keyboard/mouse inputs.
+            var locoHandler = GetComponent<UltimateCharacterLocomotionHandler>();
+            if (locoHandler != null) locoHandler.enabled = isLocal;
+
+            var activeInput = GetComponent<UnityInput>(); // Corrected class reference
+            if (activeInput != null) activeInput.enabled = isLocal;
+
+            // 2. Isolate Camera: Only attach the camera if this is the local player.
+            if (isLocal)
+            {
+                var cameraController = UnityEngine.Object.FindFirstObjectByType<CameraController>();
+                if (cameraController != null)
+                {
+                    cameraController.Character = gameObject;
+                }
+            }
+        }
+
+        // --- INetworkInfo Implementation ---
+        
+        public bool IsLocalPlayer() => Object.HasStateAuthority;
+        public bool IsServer() => Runner.IsServer;
+        
+        // Return FALSE because we are doing Client-Authoritative movement!
+        public bool IsServerAuthoritative() => false;
+
+
+        // --- INetworkCharacter Implementation ---
+        // Since we are using Fusion's NetworkTransform to sync position, 
+        // we can leave these methods empty. Opsive will handle the local 
+        // movement, and Fusion's NetworkTransform will drag the remote players.
+        
+        public void SetPosition(Vector3 position, bool snapAnimator) { }
+        public void SetRotation(Quaternion rotation, bool snapAnimator) { }
+        public void SetPositionAndRotation(Vector3 position, Quaternion rotation, bool snapAnimator) { }
+        public void ResetRotationPosition() { }
+        public void SetActive(bool active, bool uiEvent) { }
+
+        // Optional interface stubs for weapons/items (leave empty for now to focus on movement)
+        public void LoadDefaultLoadout() { }
+        public void EquipUnequipItem(uint itemID, int slotID, bool equip) { }
+        public void ItemIdentifierPickup(uint id, int amount, int slot, bool immediate, bool force) { }
+        public void RemoveAllItems() { }
+
+        // New missing interface stubs for Shooter/Melee compiled code
+        public void Fire(Opsive.UltimateCharacterController.Items.Actions.ItemAction itemAction, float strength) { }
+        public void StartItemReload(Opsive.UltimateCharacterController.Items.Actions.ItemAction itemAction) { }
+        public void ReloadItem(Opsive.UltimateCharacterController.Items.Actions.ItemAction itemAction, bool fullClip) { }
+        public void ItemReloadComplete(Opsive.UltimateCharacterController.Items.Actions.ItemAction itemAction, bool success, bool immediateReload) { }
+        public void MeleeHitCollider(Opsive.UltimateCharacterController.Items.Actions.ItemAction itemAction, int hitboxIndex, RaycastHit raycastHit, GameObject hitGameObject, UltimateCharacterLocomotion hitCharacterLocomotion) { }
+
+        public void ThrowItem(Opsive.UltimateCharacterController.Items.Actions.ItemAction action) { }
+        public void EnableThrowableObjectMeshRenderers(Opsive.UltimateCharacterController.Items.Actions.ItemAction action) { }
+        public void StartStopBeginEndMagicActions(Opsive.UltimateCharacterController.Items.Actions.ItemAction action, bool begin, bool start) { }
+        public void MagicCast(Opsive.UltimateCharacterController.Items.Actions.ItemAction action, int index, uint castID, Vector3 dir, Vector3 target) { }
+        public void MagicImpact(Opsive.UltimateCharacterController.Items.Actions.ItemAction action, uint castID, GameObject source, GameObject target, Vector3 pos, Vector3 norm) { }
+        public void StopMagicCast(Opsive.UltimateCharacterController.Items.Actions.ItemAction action, int index, uint castID) { }
+        public void ToggleFlashlight(Opsive.UltimateCharacterController.Items.Actions.ItemAction action, bool active) { }
+        public void PushRigidbody(Rigidbody rb, Vector3 force, Vector3 point) { }
+    }
+}