Billy Joe Cobra

Baruch Cohen, better known as Billy Joe Cobra, is a former world-famous rock star. The Wright family moved into his home not long after Billy died, and led him to meet Spencer Wright, his distant relative. Together, the two of them get prank-style revenge on people who hurt Spencer, work to improve Spencer's image at Beverly Beverly High, and enjoy some quality "bro time" (usually resulting in hilarity).

Overall, Billy's main goal seems to be to have as much fun as possible, which causes enough problems for Spencer to clean up. Billy never turns his back on a friend though, and helps Spencer when he can.