Who said "That's not fair!"?

This quote is attributed to Kenny McCormick.

That's not fair! - Kenny McCormick

"That's not fair!"

Kenny McCormick Justice

"Mmph mmph mrmph!"

"I'm not fat, I'm just big boned"

"Dude, we're in third grade"

"This is so cool"

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."