Johnny Test

Johnathan Q. Test, or just Johnny Test, is a kid with fiery hair, and a member of the F Gang.

Personality
He is very hyperactive, selfish and often messes with his sisters' inventions, causing trouble and mayhem, but just as often proves himself to be extremely clever such as by frequently tricking his genius sisters or saving the day from whatever danger happens to show up. Johnny can be considered very spoiled and stubborn, as he gets what he wants through deceit, blackmail, or manipulation, though he does love his sisters in a way only a brother can.

Trivia

 * It has been revealed that Johnny often hangs out with Buford and Baljeet in the series.