Baron Bad Beaver (aka Master of Really Terrible Evil... Things) is a comic book character whom Norb role-plays as.
Whenever Norb role-plays as Baron Bad Beaver, his homemade costume consists of a medium blue bucket (as the helmet), a purple cape with a scalloped fringe, a lime green-and-purple long sleeved shirt, blue-and-light blue gloves, blue boxer shorts, and lime green-and-purple boots.
During his stint as Baron Once-Bad Now Good Beaver, pink hearts were added to the cape and a silly-looking face painted on the helmet. ("Muscular Beaver 2")
The Angry Beavers Wiki has a gallery for Baron Bad Beaver