Pahan
Pahan is like a genius with a bad temper. He can teach you everything, but he'll probably yell at you while doing it.
Pahan taught me algebra. I got a C. He gave me a D for yelling at me.
Pahan said, 'You're not learning. I'm not learning. Let's all just fail.'
My friend asked Pahan for advice. He said, 'I'll help you, but I might break something along the way.'