Personal Info:
Real Name: Meranno
Also Known As: No Known Alias
Place Of Birth: Atlantis
First Appearance: Invaders Vol.1 #3 (1975) Bronze Age Villain
Known Associates: Attuma, Tyrak, Lord Arno, Krang, Master Man, Baron Blood, Warrior Woman
Group Affiliation: Former member of Super-Axis
Base Of Operations: Mobile
Grudges: Sub-Mariner
Creators: Roy Thomas and Frank Robbins
Gallery: Click
Enhanced Abilities: U-Man has superhuman strength, agility, speed, endurance and durability.
Amphibious Physiology: Unlike most Atlanteans, U-Man can not only survive underwater but he can also survive on land for an unknown period of time without suffocating. habitat is the water and his body is specially adapted to enable him to survive underwater. He has gills that allow him to extract oxygen from water and his vision is specially developed to see the Green end of the spectrum, enabling him to see perfectly even in the murkiest depths of the oceans. U-Man's physiology also allows him withstand extreme changes in water temperature and his blood circulation allows him to withstand extremely cold temperatures typical of great ocean depths.
Meranno is a member of the homo mermanus species, also known as the Atlanteans. He was banished from Atlantis for treason, after allying with Nazi Germany. Filled with a burning desire for revenge against Atlantis' ruler, Prince Namor, Meranno renamed himself U-Man (or, Unter-Wasser Mann) and joined the Axis Powers to fight Namor and his allies, the Invaders. Meranno used Nazi scientific procedures to augment his natural abilities, making himself much stronger than the average Atlantean and enabling himself to survive on the surface for extended periods of time.
U-Man at Marvel Database
U-Man at Comic Vine