You get the assignment to create a fused series out of the manga versions of Bleach, Soul Eater and Negima. For the most part you can do whatever you want with it but you have the follow these two rules.
- Elements from all three series has to be incoporated. It can be as little as a single character from one series as long as all three are represented somehow.
- At least one of the main characters from the three series (Ichigo, Maka, Soul or Negi) has to have main character status in the fused series. As long as this rule is followed you can make whoever you want to into a main character.
Besides that you're free to do whatever you like. Villains can be heroes and vice versa. Power levels are whatever you want them to be. It doesn't even have to be an action genre series. And so on.
Have fun and let's see what you can come up with.