Darkninja

A terrifying ninja who possesses the soul of "Hagane Ninja" and wields the demon sword "Beppin". In part 1, he acts as Laomoto Khan's hitman, but the motives behind his loyalty are a mystery. Following the downfall of the Soukai Syndicate, he becomes a freelance ninja on his own mysterious quest. ~! He was the one who killed Fujikido's family - however, contrary to Ninja Slayer's initial suspicion, there was no personal grudge involved - he was simply ordered to destroy the whole building in which Fujikido and his family also happened to be in.!~