Ultra-V is Main Protagonist one of the playable monsters.

ULTRA V (ウルトラV)
Ultra-V is a giant, high-tech robot. He was first built by Japanese scientists to battle the rampaging monsters. However, these scientists made the mistake of infusing Ultra V with the alien fuel. Once activated, he became self-aware, leaving the lab under his own control.
Ultra V is the fifth version of a group of super robots designed to be saviors for cities under siege. Equipped with state-of-the-art eye lasers, space-age metal, rocket firing fists and an energy sword, Ultra V is ready to eliminate any threat to mankind. Now with a mind of its own, there is little to prevent it from unleashing its destructive technology.[1]
Ultra V -Living robot defender: This Mazinger-looking robot is fairly quick, and his jet pack adds to his maneuverability, although his durability is just average.[2]
"Ultra V was an archetype we knew we just had to have," explains Mike Giam, the creative director at SCEA Santa Monica. "To have an all-star lineup of monsters without a character that evoked the giant robot anime of the past-like Great Mazinger, Brave Raideen, Getter Robo, or Grendizer-would have been unforgiveable."[3]