Updated RelayNode;

Added ISlot interface;
Added ProxySlot;

Runtime/Models/Slots/ProxySlot.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Misaki.GraphView
+{
+    [Serializable]
+    public class ProxySlot : ISlot
+    {
+        [SerializeReference]
+        private ISlot _slot;
+
+        public SlotData SlotData => _slot == null ? default : _slot.SlotData;
+        public List<SlotData> LinkedSlotDatas => _slot?.LinkedSlotDatas;
+        public bool IsLinked => LinkedSlotDatas?.Count > 0;
+        public DataNode Owner => _slot?.Owner;
+        public object Data => _slot?.Data;
+
+        public void Bind(ISlot slot)
+        {
+            _slot = slot;
+        }
+
+        public bool Link(ISlot other, out SlotConnection connection)
+        {
+            if (_slot == null)
+            {
+                connection = default;
+                return false;
+            }
+
+            return _slot.Link(other, out connection);
+        }
+        public void Unlink(ISlot other)
+        {
+            _slot?.Unlink(other);
+        }
+
+        public void ReceiveData(object data)
+        {
+            _slot?.ReceiveData(data);
+        }
+    }
+}