Here is the list of the free characters. Please PM me if you wish to play as one. If the character is taken the name will be highlighted. Also, OCs are very welcome.
List
Harry Potter
Hermione Granger
Ronald Weasley
Ginny Weasley
Fred Weasley
George Weasley
Percy Weasley
Charlie Weasley
Bill Weasley
Molly Weasley nee Prewett
Arthur Weasley
Sirius Black
Remus Lupin
James Potter
Lily Potter nee Evans
Peter Pettigrew
Minerva McGonagall
Albus Dumbledore
Severus Snape
Rubeus Hagrid
Pomona Sprout
Filius Flitwick
Lucius Malfoy
Draco Malfoy
Narcissa Malfoy
Lord Voldemort/Tom Riddle
Bellatrix Lestrange
Fenrir Greyback
Luna Lovegood
Neville Longbottom
Alastor Moody
Fleur Delacaur
Nymphadora Tonks
Vincent Crabbe
Gregory Goyle
Pansy Parkinson
I haven't listed everyone, as you have seen. If you wish to be one of the unlisted characters, PM me.
While not everyone can be a HP character, OCs, as mentioned before, are welcome, we do need other students, workers and even Death Eaters. So please feel free to be anyone of these.