Super Mouse

Super Mouse (超マウス, Chō Mausu) was a member of the Monster Association in the manga. He was a Demon-level monster who briefly appears to fight Garou along with Showerhead and Unihorn.

Appearance
Super Mouse is an anthropomorphic mouse with white fur and a very muscular body. He is taller than Garou and has a long ringed tail. His hands and feet similarly has ringed linings across them. Super Mouse's has featureless eyes with no irides and pupils, instead having a white sclera.

Personality
As expected of a monster, he is rather confident in his abilities and sadistic as well. However, he acknowledges the strength of higher Dragon-level mysterious beings and is willing to work alongside other monsters when fighting opponents.

History
Prior to him joining the Monster Association, Super Mouse was a lab mouse who was constantly experimented on. As a result, his body became mutated and he gained increased strength, speed, stature, and limited regeneration. Sometime later, he would come to join the Monster Association.

Monster Association Saga
While Garou and Tareo were walking away from Overgrown Rover, Super Mouse appeared alongside Unihorn and Showerhead and attacked Garou. Super Mouse deemed Garou a warmup before the fight against the heroes. Showerhead and Unihorn attacked Garou with their respective techniques, but Gaoru easily dispatched both of them. Super Mouse threw a left jab at Garou, but the Hero Hunter blocked his punch using the Whirlwind Iron Cutting Fist, creating several wounds. The monsters, however, get back up, and express surprise at Garou's superb fighting strength as they have been all evaluated by Gyoro Gyoro to be demon level threats.

Garou is scornful of such arbitrary labels and declares himself a Dragon-level monster. Super Mouse scoffs at the notion, stating only the upper echelon of the Monster Association were at that level of strength. The three monsters then prepare their special combo they developed called the Demon Trinity Bursting Speed Thrust. However, Garou already experienced a similar technique against Stinger, and is able to easily deflect the attack and Unihorn behind him. Unfortunately, the attack inadvertently hit Overgrown Rover. In anger, the monstrous dog fires an energy blast at everyone in the hallway. Showerhead attempts to stop the attack with his maximum water pressure, but he is vaporized alongside Unihorn. Super Mouse is confident that his regeneration can revive him, although the energy blast overwhelms him, and he meets the same fate as his comrades.

Abilities and Powers
Being a Demon-level mysterious being, he is naturally a strong fighter and was able to take some blows from an evolving Garou. However, he is completely helpless against Dragon-level monsters like Overgrown Rover and was obliterated by just one of his energy blasts.

Physical Abilities
Enhanced Strength: Super Mouse boasts impressive physical strength, and was able to shatter walls with complete ease. Enhanced Speed: Being a Demon-level monster, Super Mouse has a high level of speed.

Regeneration: Due to his time being experimented on as a lab mouse, he gained a limited degree of regeneration and was able to quickly regenerate from Garou's attacks. But his regeneration has a limit, and this was seen when he was killed by Overgrown Rover's blast.

Fighting Style
Hand-to-Hand Combatant: Super Mouse fights mostly as a hand-to-hand combatant.
 * Triple Demon
 * Blasting Speed Thrust : Super Mouse throws Unihorn before Showerhead accelerates Unihorn into a target.

Trivia

 * Bomb would have beaten the Super Mouse in one swift attack before it can even react.