1. The character colors don't have to be different colors from other user's characters, just your own. And no, the characters aren't assigned colors.
2. Yes, you can use celebrities as pictures for your characters. Try to avoid using the exact same character picture as another user. When the site is larger it might be a bit more acceptable.
Katerina Sketch • District 10 • 13 years old
Chey Vanzo • District 4 • 15 years old
Tetris Vanzo • District 4 • 15 years old • Career
Lexi Alese • District 4 • 15 years old (GIVEN TO HAUNTEDTRIBUTE)
Austin Spears • District 4 • 15 years old
Hello. How are you? Good. Nice to Meet You! ~Billie Joe Armstrong