Harry Potter: A Thousand-Year Journey with the Four Founders

[Contains OOC, original characters, and lots of headcanon. Two male couples, five pairings. I'll include the Witch-Hunt Plan in the story. Updates are irregular.]

Features GGAD, GGSS, RRHH, DMHP, and an original male lead x Professor Snape.

The story spans 965 to 1998 and is expected to have four volumes. The Four Founders transmigrate, but the protagonist has lived to such an old age that a thousand years pass in the blink of an eye for him. A god of guardianship from another world, who lost his dearest friend, transmigrates into the world of Harry Potter. The reason is simple: the soul of the person he lost is in this world, and he wants to find that soul and recover what he once lost. But when he arrives, he discovers that he got the timing wrong and went back nearly a thousand years too early! There's no way to adjust the timing and arrive later, so he begins adapting to this world.

The Four Founders' Era

He joins the Four Founders in opposing the Church and establishing Hogwarts (long).

The Dumbledore Era

The male protagonist, who did not transmigrate, and the Four Founders, who did but know him, first visit Godric's Hollow to witness GGAD's love. Then they accidentally end up in China and fight in the War of Resistance Against Japan (short).

The Marauders' Era

He lives next door to Lily. One day, the protagonist discovers that Snape is the reincarnation of his dearest friend's soul, and that Lily looks a lot like his friend. A prediction reveals that the two will cross paths when they are 31 (short).

The Next Generation

After accidentally drinking Godric's secret potion, the Four Founders and the protagonist all turn eleven and start school alongside Harry (very long).