1) Backdraft criminal 2) Bad lighter 3) Certain criminal 4) Criminal 5) Crook 6) Felon 7) Felon of a sort 8) Fiery felon 9) Firebug 10) Flaming guy 11) Hired torch 12) Ignition technician 13) Ignominious igniter 14) Incendiary 15) Incendiary sinner 16) Insurance fraud perpetrator 17) Kind of felon 18) Lawbreaker 1) Barnburner 2) Felon 3) Firebug 4) Fireraiser 5) Pyro 6) Torcher 
[n] - a criminal who illegally sets fire to property
arsonist Someone who commits an act or crime of willfully, wrongfully, and unjustifiably setting property on fire often for the purpose of committing fraud in order to collect insurance payments.
Refers to an ineffective relief pitcher who usually arrives into the game without a base but proceeds to give up numerous runs. The reverse of a fireman.
incendiary noun a criminal who illegally sets fire to property
a person who commits arson.