Briareos

Ten arms branched from his frame, and his gear was built around them, with plating fitted over the shoulders of most. A helmet swallowed his face entirely, leaving nothing of it visible, and the rest of the armor ran red.

Records of what he was like are thin. What the account does show is a man who held his post against a Tomura Shigaraki piloted by All For One and kept fighting until it killed him, which speaks to a firm sense of duty.

He and Gyges drew guard duty on the Bronze Gate, the mainland approach to Tartarus. Word of the fighting against the Paranormal Liberation Front reached them as a string of losses, with heroes dead in large numbers, villains loose, and Tomura plus seven Near High-End Nomu among the escapees. Then several of those Nomu landed in front of the gate itself.

Briareos reacted at once, turning the prison's security robots loose on the attackers while he and his brother worked their miniguns. Spikes fired from the body of one Nomu answered that, and the volley killed him.

His Quirk was never named. It seemed to account for the ten arms, though whether they retracted or were simply part of him is unrecorded, and it granted both the versatility of many hands and the strength to handle weapons as heavy as those miniguns. His name comes out of Greek myth, where Briareos is one of the three Hecatoncheires giants set to guard the gates of Tartarus.