The Anti-Guy is probably one of the most powerful Shy Guy bosses there is. He has a distinct black color and is apparently able to kill anyone by touching them, hence the nickname "Deadly Guy", they live up to their reputation by being very powerful causing so much damage with just one attack. It is also noted, that they don't like to get in fights, warning the challenger(s) that they are powerful and trying to persuade them to leave. They can actually cause a lot of damage but if beaten they can give a truckload of Exp. They have only been seen in the original Paper Mario game.