I have a MonoBehaviour object, and I would like find if there is a Start/Update for the object that can run while viewing/editing the object in the editor?
Could you please add more clarity to the question. All objects will have a Start() and Update() function attached to it. You can press Play button (Ctrl+P) to check it out. However, if you edit the Object in Play/Game mode in Editor, it will revert back to its original properties once you stop the Game.