Angry Grandpa

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

Appearance
He used to look like a regular human before transforming into a monster.

Personality
Angry Grandpa hates rowdy children. He will attack children for being rude. A example of this hatred is that he says: "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 Speed-o'-Sound Sonic, who is disguised as Saitama.

Abilities and Powers
Angry Grandpa was able to put up a fight against Mumen Rider but was easily taken out by Speed-o'-Sound Sonic.

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

Enhanced Durability: Angry Grandpa can withstand bullets.

Frustration Accumulation: 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.

Trivia
Angry Grandpa is the only monster Speed-o'-Sound Sonic fought in order to save someone else.