Ryan "Sumo" Sumouski is the overall deuteragonist of the 2013 Cartoon Network show, Clarence.
Sumo used to have long golden 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, blue jeans, which is basically cut-up to shorts and dark red boots.
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.