Another idea. Not a reincarnation.
In the DC universe, a child wakes up in the middle of the night on fire. The entire room he was in was also in flames. In the end, the whole apartment complex was destroyed in flames, and he was powerless to stop it. 13 people died, including his parents. All because of his meta-gene that transformed his body into a living flame. Even when he is asleep, he is on fire. He can’t even speak. And it wouldn’t be for many years that he would finally be released from his special holding cell(that Batman refused to call a room), and actually use his power for betterment of all.