In which TV series is Skyler White a main character?

Who played Carly Shay in 'iCarly'? Who played Alex Russo in 'Wizards of Waverly Place'? In which TV series is Walter White a main character? Who played Skyler White in 'Breaking Bad'? Who played Hank Schrader in 'Breaking Bad'? In which TV series is Hank Schrader a main character? Who played Gus Fring in 'Breaking Bad'? Who played Mike Ehrmantraut in 'Breaking Bad'?