(courtesy of  Crescent-Blue-Zero and featuring an OC from  Ember)

Ember is the alchemy expert/assistant at X²Y, being the more practical thinker compared to the few others who engage in science/potion-making.

He is adept at practical thinking, especially when it comes to strategy and conflict, and keeps himself focused with a seemingly stoic and serious demeanour when doing so. At other times, especially when dealing with personal baggage or he's been pushed far enough, he has a fiery temper to the point where even his own boss is anxious to be around him at those times.

Beyond that, though, he is definitely good-natured with what he does. Even better, he is jovial the rest of the time (when his mood is optimal, that is) not to mention he is not above finding someone sufficiently hot... at which point, he gets very romantic.