|“||Just for old times' sake, let's play... Uncle.||”|
Eddy's Brother is the unnamed older brother of Eddy, who had moved out of his parents' house sometime prior to the show's current setting. Until Ed, Edd n Eddy's Big Picture Show, Eddy's brother was never seen, only mentioned by Eddy and the other characters. He made his debut in the movie as the true main antagonist, and is the only adult character to be seen and heard on the show. His actual name remains unknown.
Eddy's brother is at least a head taller than Eddy. He wears a dirty brown newsboy cap, yellow sports jersey with the number "62" on it in light blue along with the neck collar, red flannel jacket, khaki pants with a wallet chain similar to Eddy's pants, and greenish-grey shoes. His face and hair is somewhat similar to Eddy's, though he has a much more pronounced chin and goatee. He also wears a gold ring on his right hand and white sunglasses with green shades.
Because Eddy's Brother never appeared on the show until the very end, the only information about him could be gleaned from the other characters talking about him, mainly Eddy. According to Eddy, his older brother was extremely multi-talented, being a "whiz" at everything from brick-laying to bouzouki playing, to chewing ice cubes to setting up traps. His most defining trait was being a master prankster: in season one's "Fool on the Ed," the Eds create the El Mongo Stink Bomb, which Eddy claims is a recipe from his brother before he moved out. For the most part, Eddy speaks very highly of his brother, considering him his role model and wanting to be as cool, smart, and respected as he claims his brother to have been. It's later revealed in "Ed in a Halfshell," where Eddy sets himself the task of making Jimmy his protégé, that we learn that Eddy's treatment of Jimmy is similar to that of his own brother when they were younger, giving a small glimpse into their relationship.
The third season offers more details about Eddy's brother, including a trip into his bedroom in "O-Ed Eleven", which had previously been walled off for unknown reasons. Eddy's brother's room contains a multitude of bizarre items, from a stuffed camel wearing a fez, to a bed that folds up into a refrigerator, to an entire car with a trunk full of random garbage and a live snake (which Eddy claims he'll inherit someday).
In "An Ed is Born", Eddy receives a "care package" from his brother labeled "To Pipsqueak" (his "affectionate" nickname for Eddy). It's revealed to be full of baby items, including a diaper, a pacifier, and a toy rattle, hinting that Eddy's brother does not think highly of his younger sibling.
The episode "Ed... Pass it On..." , where Eddy spreads a rumor that his brother is coming back home, reveals further glimpses into Eddy's brother's relationship with the rest of the Cul-De-Sac kids: Kevin becomes a groveling, nervous wreck, Nazz swoons at the thought of Eddy's brother, and Rolf builds an entire wall and moat around his house for fear that Eddy's brother will steal and/or harm his chickens. Sarah and Jimmy are unphased - either because they honestly don't care about Eddy's brother, or can see through Eddy's lie.
In Ed, Edd n Eddy's Big Picture Show, the Eds go on a journey to find Eddy's brother so they could live with him and hide from the other kids (most of whom they had severely injured in their latest scam). At first Eddy's brother offers to help them out, but quickly shows his true colors when he starts playing sadistic games with Eddy, first twisting his foot around while Eddy pleas "uncle", and then throwing Eddy against the door of his trailer over and over like a basketball. The other kids manage to stop Eddy's brother from further tormenting Eddy, which resulted in Eddy's brother getting hit in the face with a door and getting knocked out. He is last seen being dragged back into his trailer by the Kanker Sisters, who presumably torment him further.
In the end, Eddy tearfully admits to Double-D that everything he said about his brother was a lie he had made up to sound "cool" so that people would like him. In reality, his brother was a cruel, sadistic bully who abused Eddy all his life both verbally and physically. This plus Eddy's paradoxical admiration of his older brother would explain his own abusive behavior and inflated, fragile sense of self-worth and need for attention. Fortunately for Eddy, Double-D and the other kids forgive Eddy and the Eds, and they leave the park together as friends.
- Eddy's Brother is voiced by Terry Klassen, the main voice director for the series.
- Eddy's Brother is first mentioned in "Nagged to Ed." After observing the trailer park, Eddy says "Huh. Looks like a postcard I sent my brother once."
- In "Ed... Pass it On...", Eddy acts frightened when he thinks his brother is home. This hints that Eddy may have been mistreated by him. This dynamic is expanded upon in Ed, Edd n Eddy's Big Picture Show.
- Tally marks on the wall of Eddy's brother's room indicate that he has had 13 dates.
- Eddy's Brother was the original owner of Eddy's magazine collection, as mentioned in "The Luck of the Ed."
- Like the Kanker Sisters, his tongue color is pink.
- In the movie, a glass in Eddy's Brother's room reads "Peach Creek Diner 2000 Best Eater". Assuming that his room has been untouched since he left it, this could mean he moved out during, or after, the year 2000.
- Eddy's Brother may be lactose intolerant, as Eddy brings this up when his "brother" (Jimmy and Sarah in disguise) demands a sundae in "Ed... Pass it On...".
- The character design for Eddy's brother's was done by storyboard assistant and character/prop designer, Cory Toomey.
- Eddy's brother has a poster on his bedroom wall referencing the famous Greek singer Nana Mouskouri. This implies that he is (or was) a fan of her music.
- In the movie, Eddy reveals that his brother is a fan of the TV series, Matlock.