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MIPS The Rabbit is a rabbit-esque character from Super Mario 64 who appears in the basement and runs when the player comes near, and also notorious for stealing quotes from books. He seems to enjoy tea.
MIPS is a mischievous, minor character. While he very rarely appears in SMG4's bloopers, one of his appearances is in Super Mario 64 Bloopers: HALL 9000. In this episode, he went into the castle, but the security system raped him.
His biggest and most prominent role, however, is in Easter 2016: The Explosive Easter Hunt., when he goes crazy from eating too much of Luigi's chocolate. After the giant egg bomb exploded, sending Mario, Luigi, Toad, and SMG4 to the hospital, MIPS is seen asking SMG4 for chocolate. It is unknown what happened to him after that.
MIPS reappears in SMG4: Mario Does The Chores, he remains in the basement and helds a gun, thus scaring Bob making him unable to clean the basement as told by Peach. Mario tries to help him clean but MIPS is too dangerous, he then sees Luigi and tells him that Peach told Luigi to clean the basement, and then get's shot by MIPS many times. He is also later seen near the end of the video chasing Bob down the hallway.