Mr. B is one of the Tree Fort's tenants in the episode, "Ocarina." He can be seen walking across Finn's face while telling Mr. F that he can't wait to get home so that he may wash his "Big Fat Butt."


His appearance is very similar to Mr. F, with the nose, skin color, business suit, and party hat. The difference is that he is much smaller, has a proportional body, small shoes, overalls, and a big flappy butt.


Mr. B has a very similar personality to that of Mr. F. He also seems to care for Mr. F but just walks all over Finn and Jake.


  • His appearance may signify that he is related to Mr. F.
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