11) Summer Roberts (The OC)
When Summer Roberts was introduced in the show, it was for a brief period. She was just a supporting character to the main protagonist Marissa Cooper. However, her chemistry with another protagonist, Seth, caught the eyes of the audience and the screenwriters. They had an opposite attracts charm, with Summer being confident and sassy while Seth was awkward and nerdy. This transitioned her from a supporting role to being one of the core cast members.
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Edited by Anshika Jain