Tetsuronin is the world's most powerful powered armour hero. If you want a scale of how good this guy is, he fights giant monsters single-handedly, aaaall the time. This is the guy that Defender would probably fanboi about. He's not on the scale of Doctor Destroyer, though, but he's up there.
His identity is public, one Masahari Yohi. His main weapons are energy beams he can fire from his large cannon gauntlets.