Kenshiro
Kenshiro (Ken for short) is the main character of the Hokuto no Ken manga, anime and related media. He is the 64th successor of the Hokuto Shinken style and considered one of the greatest successors in its 1,800 year history.
His famous catchphrase You're already dead! (お前はもう死んでいる Omae wa mou shindeiru!) is delivered to many an opponent he has killed before they even know it.
Kenshiro was originally an orphan from Taiseiden, Shura and a descendent of the Hokuto Sōke bloodline. He was sent to the mainland by Jukei as a baby to be adopted by Ryuken, master of Hokuto Shinken. Ryuken named him after his older brother Kenshirō Kasumi, since they shared the same Big Dipper-shaped birthmark on their heads.
Kenshiro watched his adoptive brothers train in the art of Hokuto Shinken and decided to join them in the fight to become Ryuken's successor. Despite being younger and more naive than his older brothers, Kenshiro was a promising student who ultimately earned the title of successor.