Sumo Wrestlers are human Special Agents that cost 65 Monkey Money to buy. They have a short range, 2 cm, but can pop 8 bloons and is quite fast. They are larger that a regular monkey, with black hair, pale skin, and a green shirt.
The Pro Version of a Sumo Wrestler is a Hulk. It is considerably larger, has a larger range (3.5 cm), greater pop (12), and is really fast.