Scott

Scott is the first character to be older than the original cast (old enough to drive) to be scene in Ed, Edd n Eddy.  He made his first, last, and only appearance in "Toon Dates" in which Ed went on a date with Daphne from Scooby-Doo fame, as part of some sort of reality show. In the short, he was working the drive-thru and asked Ed if he wanted anything for "the lady." His appearance is loosely based on Scott Diggs Underwood, someone who worked on the show.

Note:  Scott does not appear in the actual series, and there were other teenaged and adult characters in bumbers featuring the Ed's.