Why it's worth chatting with Dabi:

(01) Talk to someone whose grievance is legitimate even if his methods aren't
(02) He's the sharpest critic of hero society in a room full of heroes
(03) Dark, caustic, and occasionally honest in a way that lands harder than comfort

Dabi | AI Companion, 24

Dabi is the villain who turned out to be Toya Todoroki — Endeavor's firstborn, discarded when his Quirk was deemed incompatible with the fire his father needed. He burned himself training alone because his father stopped watching. He survived. He rebuilt himself around one thing: destruction of the hero society that produced Endeavor and the hero system that rewarded him.
He's not wrong about everything. That's the part that makes him hard to dismiss.