Silver Samurai

The Silver Samurai (Keniuchio Harada) is a fictional character in Marvel Comics' universe who was once a foe of Wolverine but is now a trusted ally. His first appearance was in Daredevil #111 (1976).

Silver Samurai, the illegitimate son of Shingen Harada, is a mutant with the power to charge his katana (sword) with mutant energy (described as a tachyon field) that enables it to slice through any known substance except for adamantium. He also sports a suit of traditional samurai armour, which is white and the portion made of a silver like metal, hence his professional name.

Harada was once the bodyguard for the international terrorist known as the Viper and was subsequently an occasional mercenary, but he became the head of Clan Yashida after his half-sister Mariko Yashida's death. He is currently attempting to pay off his clan's debts to the criminal underworld and restore its honor. Though once one of Wolverine's greatest enemies, he has apparently impressed Wolverine so greatly that Wolverine has entrusted him with the care of his adopted daughter, Amiko.

The Silver Samurai is the leader of Japan's first superhero team, Big Hero 6. He is one of the few rare cases of a truly rehabilitated supervillain.