Who said "This is so unfair"?

This quote is attributed to Kenny McCormick.

This is so unfair - Kenny McCormick

"This is so unfair"

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."