Kitsumo is a competitive and wrestling Psymonster who dedicates his life to the ancient art of the fighting sport in the Psymonster World. He has a powerful ability to stand perfectly still while a destructive and antagonistic Psymonster tries to push him over or out of the fighting ring. He has recognized wherever he goes, and is always happy and peaceful to stop and sign autographs for his many fans. Kitsumo may be very big and strong, but he is also extremely health-conscious. He watches his calories, makes sure to get plenty of fiber in his meals, and always finishes his nutritious fruits. Like he says, any Psymonsters can't get big and strong without taking good care of themselves.
He is an extremely obese, barefoot sumo wrestler with tan skin, hazel eyes, black hair tied in a bun, black eyebrows, a purple shirt, blue shorts, and a gray samurai helmet.
- The name "Kitsumo" is probably derived from the word "sumo", meaning a Japanese form of heavyweight wrestling, in which a wrestler wins a bout by forcing his opponent outside a marked circle or by making him touch the ground with any part of his body except the soles of his feet.
- Kitsumo is the only obese human Psymonster.
- Kitsumo, Exquistador, and Concavalier are the only Fighting Psymonsters as humans.