Gelman is a school bully at Third Street School.
Gelman is always looking for kids to bully for no reason. His previous target was a boy named Stemple, until he moved away. Since then he started picking on Gus. Out of every kid he bullied Gus was his main target, until Gus stood up for himself, however in "A Great State Fair", he starts being a little nicer to Gus and stops bullying him.
It’s mentioned in "A Great State Fair" that Gelman doesn’t have a good relationship with his father.
He's not shown to have any friends, but on a few occasions he hangs out with Lawson and his gang. He‘s the most feared bully in Third Street School. Everyone is scared of him, even Spinelli. Though this situation changes after the episode "Gus' Last Stand". He also gets scared when he narrowly misses Gus' plan to put him in a cage (or, as Gus said, "Get Gelmanized").
Gelman is a tall, fat ten-year-old boy with messy red hair and freckles. He wears a black T-shirt, grey pants, and sneakers.
- It remains unknown whether Gelman is his first name or last name.
- Gelman is voiced by Justin Shenkarow, who also voiced another bully named Harold Berman from Hey Arnold.
- In the episode "The Shiner", his favorite kind of cookies are the chocolate chip cookies that his Granny bakes for him. It also shows Gelman‘s nice side when he decided to give his cookies to T.J. and the gang.
Characters: T.J. Detweiler | Vince LaSalle | Ashley Spinelli | Mikey Blumberg | Gretchen Grundler | Gus Griswald | Captain Bradley | Cornchip Girl | The Diggers | Hustler Kid | Erwin Lawson | Miss Grotke | Muriel Finster | Becky Detweiler | Dr. Phillium Benedict | Menlo | Brock | Peter Prickly | Bald Guy | Butch | Ashley Armbruster | Ashley Boulet | Ashley Quinlan | Ashley Tomassian | Fenwick | Brandon the Singer | Gelman | King Bob | Chucko | Jocko | Randall Weems | King Freddy II | Chewy | Spencer | Swinger Girl | Upside-Down Girl | Gordy | Hector | Miss Lemon | Lunchlady Irma | Tubby | Jordan & Jerome | Flo Spinelli | Bob Spinelli | Guru Kid