Ueuecoyotl: [Aztec Empire/Mexico] The Aztec god of sex and irresponsible gaiety.
Ulu Vakk: [USA] Color Kid, the pre-crisis version of the substitute Legionnaire with the ability to change colors on objects (DC Comics).
Umi-Bozu: [USA] Yokai/water spirit from DC Comics Red Circle.
Uncle Scrooge: [USA] The World's richest duck (Disney).
Unicorn, The: [USA] Character from Jim Krueger's series Foot Soldiers.
U.S. Male: [USA] Time displaced superhero from Shadowline, Jim Valentino's part of the original Image Universe.