Boros

Boros was an alien from the Oaa'kalni Universe and was the leader of the Dark Matter Thieves, a group of alien invaders responsible for the destruction of A City. Like Saitama, Boros faced a self-imposed existential crisis, having become so powerful that no battle thrilled him. His intergalactic travels in search of a worthy opponent had one point drew the attention of the Entity known as The Brawler, the being his race worshipped and allowed him to serve as one of the possible candidates to be trained by it’s herald, Rukahn Khrayf and fought in the last decades of the Great War, after the war he was sent by Rukahn of a powerful warrior the Brawler felt and sent him to the Oaa’kalni Earth, where he was killed by Saitama

Trivia

• Biris is the antagonists from the Alien Invasion Arc from One Punch Man and was one of few characters that managed to take on more then one punch from Saitama.