Harry Potter and Harry Dresden are the same guy

An anti-establishment wizard and his misfit friends fight evil cultists and magical monsters while dodging the corrupt and incompetent bureaucracy of the magical world.

Potter grows up to join the Aurors, only to get the Lethal Weapon treatment and become a private eye with a target on his back. Goes on to tangle with the mortal mob, picks fights with the vampire cartels, and piles up debts against the faerie courts. All while gathering a clientele of the weakest and most vulnerable in the wizarding world.