Cinnarian

Cinnarian is a choice in nature gender where one chooses a gender, and while being it they burn it to a crisp so they need a new gender. They can’t actually use the same gender again (or at least can’t right after, it needs to “heal”), and hop around from gender to gender, burning them up.

Cinnarian is a pun on CINN and cinnamon, what’s used to make fireballs/hot candy.