Pluton

Pluton is the king of the Underworld.

Appearance
Pluton is a gigantic pig-like creature.

Alien Conquerors Arc
He wrecks havoc in Y-City. However Saitama and Genos quickly come and dispose of him.

Abilities & Powers
Not much was seen of his abilities, due to how quickly Saitama disposed of him, however it can be assumed that he is very powerful because he is a Dragon.

Physical Abilities
Immense Strength: Pluton easily destroys a large portion of Y-City.