David Alan Abramczyk said:
Uggh... This is reminding me of this one awful sue-tastic massive crossover Ranma fic I once read years ago (I might have mentioned it before?); where they reveal that Belldandy was brainwashed by The Almighty One into believing she was meant to be with Keiichi, and that her 'true soulmate' (Ugh) was actually Ranma.
I'm not sure if I should respond, since this was posted almost 2 years ago, but it sounds like "Path of Chaos" by Lord Rance, and the subsequent discussion confirms it to me. Since nobody outright said it...
As for "Long time ago", it was old enough that apparently I have two links in my bookmark file, one of which is the old URL scheme from the first five years that was replaced in 2003.
https://www.fanfiction.net/read.php?storyid=1234810&chapter=1
the modern one is:
https://www.fanfiction.net/s/1234810/1/
Path of Chaos: Ascension of Supremacy
By: Lord Rance
A powerful entity has been reborn after so many eons being dead, but what if the entity doesn't want to go back to what he used to be? This is a story of a powerful god, who doesn't want to become a god.
Rated: Fiction T - English - Romance/Adventure - Ranma - Chapters: 23 - Words: 564,368 - Reviews: 755 - Favs: 691 - Follows: 349 - Updated: Apr 30, 2007 - Published: Feb 13, 2003 - Status: Complete - id: 1234810