The list is simply too long to copy all of it here. You can find a list, which I think is reasonably complete, in the Wikipedia, article "List of Doctor Who cast members".
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Luke Spencer
Ghostbusters II
The characters in Scrubs are the divine JD(John Dorian), Elliot Reid, Carla Espinoza, Turk, Dr Cox(known to his friends as Perry, his full name is Perseville), Dr Kelso(evil)and the janitor. Those are the main characters, although there are many more. New series of Scrubs on at nine o clock on thursdays, it's the last one with JD in it, so make the most of it.
The Joker is the foil for all other characters in the Dark Knight. He forces all characters to develop and become better or worse because of him. Batman is also a foil for the Joker.
All the characters in the twilight series are fake.