Recurring character
Some notable examples of main characters who were originally recurring characters are: Eli Gold on "The Good Wife"; Leo Chingkwake on "That '70s Show"; Angel and Oz on "Buffy the Vampire Slayer"; Marc St . James on "Ugly Betty"; Vanessa Abrams on "Gossip Girl"; Zack Allan on "Babylon 5"; Steve Urkel on "Family Matters"; Donna Moss on "The West Wing"; and Felicity Smoak on "Arrow" . 
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