Who played Abed Nadir in 'Community'?

Who played Sue Sylvester in 'Glee'? In which TV series is Sue Sylvester a main character? Who played Jeff Winger in 'Community'? Who played Troy Barnes in 'Community'? In which TV series is Abed Nadir a main character? Who played Alicia Florrick in 'The Good Wife'? In which TV series is Alicia Florrick a main character? Who played Elena Gilbert in 'The Vampire Diaries'?