Ryan "Sumo" Sumouski is one of the three main protagonists (More as a deuteragonist)
in Clarence. He is one of Clarence's best friends.
Sumo is a scrappy, streetwise kid who grew up on the right side of the wrong side of the tracks. When problems arise, Sumo's solutions are unorthodox and often messy. A wild card and fearless to a fault, Sumo is unpredictable, independent, and often acts without thinking things all the way through. Sumo is fiercely loyal to his friends, and always available. Jeff and Sumo are polar opposites, but Clarence bridges the gap between them. Sumo is the instinctual third of this trio. However in the episode, "Chimney", it is shown that he is quite handy as he is able to build a ladder out of sticks and shoe laces.
Sumo used to have long, brassy hair, but asked Clarence to cut it, as shown in the "Pilot". He currently has no hair at all, except for several strands. He has a big forehead, small, and somewhat crooked teeth, with spaces in between some, and has big eyes and big pupils as well. Sumo wears a black t-shirt, cut-off jean shorts, and dark red boots.
In Season 3, he wears a West Aberdale Elementary uniform, which it consists forest green short sleeve shirt and khaki pants, but Sumo cut them short to look closer to his old clothing.
Jeff - Sumo finds Jeff a bore. Even though they did have fun at Jeff's house when Clarence was away, he still finds him boring. The two of them are friends, but Clarence seems to be the one that glues their friendship together.
In "Dream Boat", Sumo's last name was "Sumozski", but however in "Space Race", it is spelled as "Sumouski", while in "Sumo Goes West", his last name is "Sumowski". It is unknown if this is a spelling error.
This led to some minor confusion and controversy in regarding to the last name changes, that had affect two other characters as well, such as Clarence, (who went from Wendell to Wendle), and Jeff, (who went from Randall to Randell).