Angry Grandpa

Angry Grandpa (マジギレ, Majigare) was a monster in the audiobook, "Sonic, becoming Saitama".

Personality
I’m gonna teach all the kids around here a lesson in manners! and make sure none of them never try to do whatever they want again like it’s a game!

History
Pushed over the edge by screaming kids and loud music in public, Angry Grandpa soon found himself as monster.

Sonic, becoming Saitama
Angry Grandpa fights Mumen Rider, but is eventually taken out by Sonic, who is disguised as Saitama.

Abilities and Powers
Angry Grandpa was able to put up a fight against Mumen Rider.

Physical Abilities
Enhanced Strength: Angry Grandpa is strong enough to make in the ground.

Enhanced Durability: Angry Grandpa can withstand bullets.

Frustration Accumlation: As Angry Grandpa accumlates frustration, he can unleash bursts of immense power.

Fighting Style
Hand-to-Hand Combatant: Angry Grandpa fought Mumen Rider in close quarters.
 * Furious Outburst Punch: The punch is strong enough to destroy concrete.