Maui

No one, not even Maui himself, can pinpoint the exact moment the imperial became interested in the art of chemistry; once he did, though, he quickly found his niche: namely, blowing things up. In manic passion he spends his days, perfecting his explosives with little regard for the safety of those who wander into his laboratory and even less regard for his own; the scars on his face and claws are proof enough of that, though strangely enough if one asks the chemist (and not pyromaniac, thank you very much) about the circumstances of their acquisition he tells a different story every single time—if one can get him separated from his work at all.

Let's get something straight: Maui is not a pyromaniac. Maui might have several incredibly flammable compounds at his disposal at all times, but he does not intentionally set things on fire. Nor has he ever conducted any experiments that could be considered unethical. Slander and libel, all of it.
He does have a lab set up, with strange chemical compounds... but that's all fine. Right? Right.