Here's a list of all the different RPg's and what characthers are available and taken this includes personal created characthers.
Charmed RPG:
Available and taken list:
Piper Halliwell
Phoebe Halliwell
Paige Matthews Halliwell
Prue Halliwell
Penny Halliwell
Patty Halliwell
Leo Wyatt
Wyatt Halliwell
Chris Halliwell
Darryl
Sean Halliwell
Melinda Halliwell
Mistic
Metal Gear RPG
deathpanda
Deepthroat