Angry Grandpa

Angry Grandpa (マジギレ, Shawāheddo) 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

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

Abilities and Powers
by accumulating frustration, I can unleash limit-breaking power in an instant!

Fighting Style
Hand-to-Hand Combatant: Angry Grandpa fought Mumen Rider


 * Furious Outburst Punch: The punch is strong enough to destroy concrete.