That's a good choice! Rubick would definitely make for an awesome and unique character, given both his personality and power-copying gimmick. The strengths and weaknesses are appropriate. There's no Guest List that I saw, but that section is optional anyway, so that's fine. The first two items in his inventory aren't really necessary or that important, but by the same token, they're not offensive either. I'd be fine with the sheet as-is, so you can post Rubick to the Characters tab. Once you do, I can PM you about an entry point for your character. Welcome aboard!