In which TV series is Willow Rosenberg a main character?

In which TV series is Marie Barone a main character? Who played Buffy Summers in 'Buffy the Vampire Slayer'? In which TV series is Buffy Summers a main character? Who played Willow Rosenberg in 'Buffy the Vampire Slayer'? Who played Angel in 'Buffy the Vampire Slayer'? In which TV series is Angel a main character? Who played Ally McBeal in 'Ally McBeal'? Who played Dawson Leery in 'Dawson's Creek'?