Here's an idea for HighSchool DxD:
Issei is the reincarnation of the biblical god. I don't remember seeing that before, only crossover characters such as Naruto and Harry Potter.
At first, everyone (including the readers and Issei, as soon as he gets an explanation of the supernatural) probably thinks he's just a two-winged Angel, but when he resurrects Asia into an Angel without Brave Saint cards and is empowered by her prayers, gaining an extra pair of wings, people start putting two and two together.
"Man, I was such a prude in my previous life!" Issei said.
"Quite," Michael said, a grimace on his face for the first time in centuries, according to Issei's 'Godly' memories.
"Oh, don't be like that Michael. I'm simply stating the truth," Issei said, grinning a bit.
"If only you did not sound like Azazel in the process," Michael said, sighing.
-----
"Father!" Said a very beautiful, blond haired woman with green eyes similar to Asia's who had a pair of huge tits-
Yeah, that's the important part, Issei! He thought to himself, only to find himself getting a face full of that heavenly valley.
The woman kept repeating the word 'Father', and Issei was getting worried she might not be all there; or at least he did until he truly realized what position he was in. Then, his nose started bleeding.
"Oh no! Father, what's wrong!? Did I hug you too tight?" The woman said, twelve white wings on display. Then, she noticed Issei's 'little friend', which was not so little anymore.
"Geez Father, did you have to turn into a perv? It's one extreme or the other with you. At least, it explains why Angels no longer Fall for the sin of Lust or related sins," the Angel (?) said with a mildly annoyed expression, not as much of an airhead as she had seemed to be.
:angel: :angel:
Edit: by the way, he doesn't start out as anywhere near 'godlike' (lol), nor does he have a Sacred Gear.
Edit 3/27: Being the original Lucifer would work just as well, and might be a more interesting personality. With an ability of turning others into pure-blooded devils to boot*, and with the Boosted Gear to allow him to eventually match and surpass his son Rizevim, and Sirzechs too. So NO, he won't be more powerful than the Super Devils without his Sacred Gear. (I'm looking at various fanfic authors when saying this.)
*He did turn his followers into devils too, didn't he? And Lilith.