Overgrown Rover

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Overgrown Rover (育ちすぎたポチ, Sodachisugita Pochi) or Rover for short is a Dragon-level Mysterious Being and a member of the Monster Association. Its role is to guard the Monster Association headquarter to prevent intrusions.

Appearance
Rover is a very large black six eyed creature.

Personality
Rover behaves like a dog.

Monster Association Arc
Overgrown Rover encounters Garou and Busaiku whent the two are trying to escape to the Monster Association headquarters. Garou and Rover begin to fight, Garou ends up telling Rover to sit and punches Rover into the ground where they were fighting, leading them to fall into the headquarter's basement. After Rover returns to its original position, it encounters Saitama. Saitama tells Rover to sit and punches Rover into submission. Afterwards, Rover encounters Fubuki, Genos, Bang, and Bomb, whom were trying to enter into the headquarters. Rover starts fighting against them and during the battle none of the members of the group are able to injure Rover, even after using their combined attacks. Out of annoyance, Bang rhetorically asks why Rover couldn't simply be quiet and sit down. Rover, remembering being forced into submission by Garou and Saitama after they gave the same command, obediently sat and stopped the fighting. For the remainder of the invasion Rover's enormous size began to reduce drastically, until it became not bigger than a average dog. After the destruction of the Monster Association, Rover rejoins Black Sperm and together they followed Saitama to the Hero Association's headquarters. Rover and Black Sperm are later entrusted to Butterfly DX, Chain'n'Frog, and Forte since they lost a bet with Saitama.

Abilities & Powers
As a high-ranked member and a Dragon-level Mysterious Being of the Monster Association, Rover is an extremely powerful being.

Supernatural Abilities
Energy Blasts: Rover is capable of firing destructive energy bursts in rapid succession from his mouth.

Physical Abilities
Immense Durability: Rover is incredibly durable, it was able to withstand hits from Bang, Bomb, Garou, and even Saitama without receiving any or little damage.

Immense Speed: Evil Natural Water is capable of firing devastating high-speed jets of water in an instant. The jets of water are about as fast as bullets.