Wario: Master of Disguise/Bosses

Mad Hat Mark I
Noted attacks:

Bomb Chuck: Chucks bombs which explode a couple of seconds later. They can be destroyed by Cosmic Wario.

Jet Engine: Fires a blast underneath it which can damage you if you are under it.

Charge: Charges in a straight line of the screen, then turns around and charges the other way. Duck to avoid it.

This boss has a shield around it. He uses Bomb Chuck and Jet Engine while moving around. To beat it you have to shoot the sphere on it's head when it glows and then jump on his head with Thief Wario. He will then use Charge before repeating what he did before (you have to do this process three times). To sum it up:

Roses are red,

but Mad Hats are blue;

some shots break his shield,

and jump on his head too.