I had this idea for an Exercise in creativity.
Pick a Public domain character from a comic or a movie or whatever and re-imagine his or her place in a non established comic universe. Write down a description origin and powers/skills for your newly rebooted hero or villain.
This is an exercise to give people whom aren't comfortable writing a full fic a chance to be creative and contribute here on the fan-fic forums.
1. Cant be a hero that has a modern counterpart. For example many of the old captain marvel fawcet comic are in the public domain but captain marvel is currently in the DC universe. However there are characters that have the same name as current heroes but aren't the same person. For example We all know the Black Cat of spiderman fame. that is not acceptable but the Old Harvey comics character Black Cat is still viable for a choice.
2. If possible try and build off other entries to help weave a vibrant comic world.
3. Have fun and be creative :)