I do a good British accent, and it ranges from the likes of a Sean Connery impersonation, to Wakko Warner, to snobby business mogul, to the eccentric with peanut butter in his suitcase.
In terms of impersonations, I am quite accomplished with Sean Connery, Kermit the Frog, Wakko Warner (Animaniacs), Zoidberg (Futurama), Droopy the Dog, Shaggy (Scooby-Doo), Snagglepuss, Stewie Griffin (Family Guy), and Bubbles (Trailer Park Boys), just to name a few.
For characterizations, I have up my sleeve the hero, the villain (various), a game show host, various zany personalities, a hobo/pirate, a "slower" burly character, and a young child, among many others.