1. How many participants must be there??, I assume (Don't fully know what you mean..sorry) you mean how many people must be in for us to announce a winner.
If that's the question than we will need at least 8 participants or we will push the deadline a week. If your talking about how it's two people per category, you must do them both separately or in the same picture.
2. The membership is 3 Months Long for the winner of each category.
3. No, the comic artist (Chrisolian) and the script writer (Me) will be give the names of the characters.
Also you will be credited for the characters you provide, just to let you know.