I challenge anybody here that can take the time, to do a mahou sensei negima fic based like such.
1) Cassiopeia (the time watch) misfires, granting Negi with MPD (multiple personality disorder)
2) These multiple personalities in his head would be what-if's, such as "What if Negi had grown up with the thousand master, What if the village in the snow was never attacked" so on and so forth, with at least four to six different personalities, none of which conflict or control the main body, being as mere advisors to Negi.
3) Each of these personalities would like a different girl, depending on who they themselves wanted to be with in their own realities.
4) A decent chapter-length, and an ongoing story.
5) (this is more optional, depending on author's tastes) One of the personalities inhabiting him could be the controlling force behind Fate
6) Because of the different personalities, they have different specializations in magic. Thinking like such, say the "One who grew up without the village in the snow being attacked" was more happy-go-lucky, and decided to focus on healing magic, while one would have focused on being an archmage, another a combat-mage, and so on.
7) Set before the Evangeline arc, and manage to do all of this without overpowering Negi. Based on a story with a similar premise (From six, H.E Grays) on ffnet, you could say his magical energy is split between the personalities, to keep them alive.
8) A couple of chapters in, start killing off the personalities, maybe because of some traitorous personality, or maybe by some external means. When they die, leave impressions of their lives on Negi, making him relive there life and learn their specialties.
I know it is a lot to ask for, but I have only seen one similar idea to it and they did an awesome job. If you would like to take this challenge, please tell me so. I had planned on doing it myself, but I lost my computer with all of my files and programs.