what if there was something special about harry's blood it was black and called itself Ragnarok and with his blood forcing harry to toughen up against the unfairness of life and driving him insane although he was already unhinged from the abuse to begin with from the dursly's abuse

requirements

1. Ragnarok has existed in each of harry's direct ancestors each time growing stronger from learning there skills and magics until the day he bursts from harry's back

2. Ragnarok still eats souls but he gains new powers from unique souls and some of there there knowledge

3. harry is insane and sophisticated but at the same time thuggish

4. harem (Ragnarok is proud of him for this)

5. harry gets a custom magical foci with some of Ragnarok's blood in it for more power

optional

1. how violent harry is in revenge against someone

2. Ragnarok can eat and absorb magical things ( like the philosophers stone, pheonix tears, basilisk venom griffindoors sword and more he could do this because magical items can develop souls with anough power and/or time

3. Ragnarok acts as a good wing-man when harry is pursuing his harem

4. Ragnarok himself can act as a magical foci