J is an American boxer famous for developing and mastering the Mach Punch, a devastating striking technique. Depending on the version you're familiar with, his background shifts: in the manga he's a student at the U.S. Naval Academy in Annapolis, while the anime reimagines him as a member of the SPA (Super Police Academy) instead. Either way, his real claim to fame is that signature punch technique.
Content compiled by AnimeList.moe from publicly available sources.
