Eh! Steve!
From Homestar Runner Wiki
Much like Strong Bad became the unplanned "star" of Homestar Runner, so has Eh! Steve become the scene-stealer of Sweet Cuppin' Cakes, Strong Bad's crazy cartoon. His name is also his catchphrase, and The Wheelchair is his arch-rival, for reasons that aren't quite clear. His mouth "exploded the universe" in Cactus Coffee and the No-Tell Motel. His simplicity is the key to his popularity; it's very difficult upon meeting him for the first time, to refrain from yelling "Eh! Steve!" all over the place.
He is depicted in a drawing wearing a tuxedo by artist Lem Sportsinterviews under the title Eh. Steven.
Eh! Steve can also be seen in an Easter egg in the Strong Bad Email kids' book.
