U – Marvel Comics

U Uboongi U-Go-Girl Ugly John UK Ultimaton Ulik Ultron Ultroids Ultrana Ultrasonic Man Ultraling Ultra-Girl Ultima Ulysses Umar U-Man UNArog Unam Undertow Unicorn Unknown Unbenannt Unbenannt II Unbenannt III Unbenannt IV Unnthinnk Union Jack Union Jack II Union Jack III Union Jack IV Unnamed Kid (Academy X) Unus The Untouchable Unuscione Uproar Uriah Uranus USAgent Ultron-Omega Ute Ultimatum Ultimus Ultron Girl Ulysses Dragonblood Unum Ursus Usha Unit Uranos Ultima Ursula Ursa Maior Ultra Adaptoid Urson       Urg Unspoken Uzi Ultimo                                                         Uatu            Ubiquistors Emissaries