Grand Unifying Guesses/Puella Magi Madoka Magica

Prior to her attempt to save Homura from Kyubey, Madoka split the lion's share of her powers and memories among several individuals in case something went wrong. They are:

 * Sayaka Miki
 * Nagisa Momoe
 * Usagi Tsukino
 * Aguri Madoka
 * Zordon: The Z-Wave was able to turn some villains good thanks to Madoka's power.

Madoka Amahane is Post-Rebellion Madoka Kaname
Homura realized that letting Madoka be around people she knew would eventually cause her to remember her past. So, she gave Madoka a completely new life,.