Fics like Harry Potter and the God of Heroes

In his approximately three thousand years of life, Perseus (also going by various monikers, such as the God of Heroes, the God in Chains, the Shield of Olympus, etcetera, etcetera, although he preferred Percy) had met many mortals, few of whom had ever made much of an impression on him. But when his old friend Albus Dumbledore asks him for help to face a threat Percy knows all too well, he feels duty-bound to accept. Tom Riddle has returned to power and the Ministry is more interested in controlling Hogwarts than protecting its students. Enter Professor Jackson: young-looking, mysteriously powerful, and completely unimpressed by authority. His Defence classes focus on one simple lesson: How Not to Die. Harry Potter feels an odd connection to his new professor, something that makes his scar prickle with warmth rather than pain. Professor Jackson seems familiar in a way Harry can't explain, and as Harry grows closer to his erstwhile mentor, he realises there's far more to the man than meets the eye.

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