What do you call someone who likes starting fires?

Answer 1

People who start fires intentionally are called pyromaniac or pyromania. These people are then most likely to start a fire by arson, in which they would then be considered arsonists.

Answer 2

A person who enjoys starting fires is typically referred to as a "pyromaniac." This term is used to describe individuals with an impulse control disorder characterized by the recurrent urge to set fires intentionally.