Blender Render or Blender Game????

If I’m making a character for a game or anything for that matter. Must I be in Blender Game while making my model for it to be able to work in my game or can I make it in Blender Render mode and it won’t really have any bearing???

The engine selection just changes the ui around. So if you are in Blender Game, you get options that affect the game engine, and in Blender Render you can change render settings. It shouldn’t have any affect on the modeling tools. Either mode is appropriate for modeling.