Yasuo Mochizuki is not a very well known hero, ranking 21 on the Hero Board. He is an intelligent hero who will always try to see the rational side of things and avoid violence when possible. He often talks down villains rather than fight but if they choose to fight he does not hesitate. He loves to fiddle with things and invent or improve hero gadgets like that of a support hero.

Mochizuki eventually married the woman he loves and had Urumi. Sadly, not too long before Urumi's was born tragedy struck. He had been assigned to a mission that was a trap, and a villain kidnapped him. Mochizuki fought with all his strength to get back home to his daughter and wife, but it was no use. Mochizuki went off the grid. There were many search parties for him, many heroes who sought after any sort of clue that could lead to his disappearance. But they could find nothing. Mochizuki is now under the control of the villain.
He has no dreams. Not anymore. The only rest he gets is when he thinks about his daughter, about how she hates him for disappearing from her life like that. She probably thinks he abandoned her. Is there pictures of him in the house? Does she even know what he looks like? Oh, what he would give to see her once again and apologise... So he fights, he sometimes breaks free and makes it out, but knowing he will be caught soon, he finds a low ranking hero, covers their mouth and nose before whispering "Don't breathe". He is then taken away by the mist, leaving only the hero to stop civilians from being taken, and rumours to spread.