Mr. F is one of the Tree Fort's tenants in the episode, "Ocarina." He can be seen talking to Mr. B while stepping on Finn and Jake because they are sleeping on the ladder that he needs to use to get to his room.
He appears to be a man with non-proportional body parts. He has a medium body with a large waist and gigantic shoes. He has tan skin and a large nose. He is wearing a business outfit, carrying a briefcase, and has on a party hat.
He seems to be uncaring yet caring. He asks Mr. B if he's excited to be home while climbing all over Finn and Jake, so he is either oblivious to his actions or is just a jerk.
- It is unknown if his party hat is associated with his occupation in any way.