If anything, Kendall was a "side character" for most of the show, meaning that she wasn't given much of a plotline due to her age. As she got older, more of her life was showcased on the show, including how she became a world-famous supermodel.
Christian Siriano - Project Runway
Christian Siriano is a world-famous designer who has dressed tons of high-ranking celebrities and the more-fabulous politicians (Michelle Obama). Fans of the show know this already, but he got his start on Heidi Klum's Project Runway. Naturally, he won his season and even went back to guest-judge in between big gigs.
Christina Aguilera - Star Search
Baby-faced Xtina was first discovered on Star Search, but it took a few years for her career to actually take off. She was the pop-rock queen of the '90s and '00s and is now a familiar face as a reality TV show judge.