In which TV series is Alicia Florrick a main character?

Who played Troy Barnes in 'Community'? Who played Abed Nadir in 'Community'? In which TV series is Abed Nadir a main character? Who played Alicia Florrick in 'The Good Wife'? Who played Elena Gilbert in 'The Vampire Diaries'? In which TV series is Elena Gilbert a main character? Who played Damon Salvatore in 'The Vampire Diaries'? In which TV series is Damon Salvatore a main character?