Light Yagami/Harry Potter
That man-child ran off to join the mafia, killed his father, absconded with his Death Note and traumatized his sister as soon as he turned adult.
Light really should have killed Mello at the age of seventeen. Or, Light frowned, was that even his real age? Mello, Mihael Keehl, certainly didn't look 20. Neither did Near, Nate River. Nor did Matt, Mail Jeevas.
Was it possible, Light realized with a sinking feeling, that all the records were fake? There were no real names in Watari's database, but there were birthdates. Were the three younger than what their records indicated? Did Light just try to kill children in his previous life?
No. No. No.
No, he is not going to think about this. That way lies insanity. Not that he wasn't already insane. Megalomania was a type of insanity and Light certainly was a Grade A patient of that type.