pyromania; pyromaniac
Refers to the psychological condition or a person with an uncontrollable impulse to set fires. Often used in clinical or news contexts.
He was arrested on suspicion of being a pyromaniac.
Pyromania is sometimes regarded as a type of mental disorder.
Compound of 放火 (ほうか, 'arson') and 狂 (きょう, 'mania' or 'madness'). The exact historical derivation is uncertain, but the word follows a common pattern for naming psychological conditions.