Art from Captain Rainbow
Mappo (マッポ, Mappo) is a robot jailer from the Japanese exclusive game, GiFTPiA.
Mappo also appears in Captain Rainbow as a supporting character. In the game, he is first seen at his post, having locked up Birdo for using the Girl's bathroom, thinking she's a male. Nick, the game's protagonist, is then required to go into Birdo's house and find an object that proves that she's a girl. The player does so, though the object in question is never revealed to the player.