Suggested by Sonic Bowser Jr has his paint brush to change shapes as well as a few gadgets like his Clown Car. Those won’t do much against Hatman though. The main issue is that Hatman has a sword at the ready which is easily better than the brush. He can use this technique to just slice away at all of Jr’s defenses until the guy goes down. I don’t see Bowser Jr really being able to do much to stand up against him since all of his attacks are either too slow or too weak. Hatman wins.