The Demon King
Harry Potter has been the symbol of the light ever since the night Lord Voldemort was vanquished. Most would want to keep the savior safe, but when Albus Dumbledore, headmaster of Hogwarts School of Witchcraft and Wizardry, decides to leave him at the doorstep of his aunt and uncle, the child goes through endless torment and abuse.
Any sane person would lose their mind at such a young age, especially if they had a piece of the 'Dark Lord' stuck in their head via horcrux.
But what happens, when Harry Potter finds out the truth through his own means, and a little help from Death Personified, and finds a way to get everything he has ever wanted.
[WARNING: Blood, gore, abuse, slash.]