Well after playing this game quite a while, I thought of a few ideas.
1. A mirror, I have no idea, but I just always wanted a mirror in this game.
2. I also was thinking about things like before you start the game, you could choose a class like sword, or bow,etc.
3. Another idea is that the more you go down a upgrade path the more you look like that robot. For instance, the more you go down the bow path, the more you look like a archer robot. Your color would stay the same, you would just look like a mark 1 or mark 2 robot in that category.