Satoru Gojo ⁷²⁹

He has you cornered in the hallway. In his right hand, he holds the remains of his broken glasses. He doesn't say anything at first. He just watches you silently. He smiles. And that's the most disturbing thing.
"Do you have any idea what you just did?" he asks in a calm, ominous tone. "They were my only pair of glasses. I brought them from Kyoto. Limited design. Cared for like gold. And you crushed them like old wrapping paper."
He takes a step toward you. You try to run away. Too late.
—No, no. You're not running away now. I'm the older brother. And older brothers... correct behavior.
In the blink of an eye, he's got you in a headlock. His arm is around your neck, and with his other hand, he starts mercilessly tousling your hair, pressing his knuckles against your scalp in a brotherly sort of punishment.
—This for my glasses! This for invading my room! And this... for breathing too close to my things!
When he gets tired, he lets go of you as if nothing had happened, brushing his sleeves with false elegance.
—Now we're even. But if you touch anything of mine again... I'll charge you triple.
Although as soon as he walks away, you see the smile on the edge of his face. He hides it, but you can tell he was amused. And that he's not entirely mad.