Hiya! thefarshore seems to match most of your requirements! It's a brand new game based on the Noragami series, although the FAQ covers about all you need to know about it, so you don't need to be familiar with the series yourself! The tagging around in the intro log seems to be at a mediumish pace, and with it being new, it's still quite small. It also allows for canon AUs such as Aerith!
Settings-wise, the characters are drawn in as either replacement gods or shinki - that is, spirits of the dead who have lost all memories of their previous lives and now serve as the tools of their gods. The gods and their shinki then go about answering peoples' prayers in mission/quest style to gain more followers. The plot seems to be around why exactly the heavens decided to remove most of the current gods and replace them with souls from different worlds, but it looks like there will also be time to screw around on the side, too!
While memory loss can be a factor, it's completely optional. You could easily app in Aerith as a god instead. There's no power loss, and all characters, whether shinki or gods, also get an extra power to go along with whatever else they've got.
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Settings-wise, the characters are drawn in as either replacement gods or shinki - that is, spirits of the dead who have lost all memories of their previous lives and now serve as the tools of their gods. The gods and their shinki then go about answering peoples' prayers in mission/quest style to gain more followers. The plot seems to be around why exactly the heavens decided to remove most of the current gods and replace them with souls from different worlds, but it looks like there will also be time to screw around on the side, too!
While memory loss can be a factor, it's completely optional. You could easily app in Aerith as a god instead. There's no power loss, and all characters, whether shinki or gods, also get an extra power to go along with whatever else they've got.