The Missouri Monster, also known as the Momo, is a bigfoot-esque creature whose folktales portray him as mostly harmless. When seen in the comic, however, he is under the control of The Grim Brothers, and as such acts violently towards Michelle. He is nearly killed when Merial tries to drown him, but is revived once again by the Grims.
The Momo has an affinity for peanut butter.