Today, Stef Sanjati is a creator on YouTube with over half a million subscribers. Her content mostly focuses on her two greatest loves — makeup and gaming — often combining the two with her otherworldly video game-inspired beauty tutorials.

Growing up in small-town Ontario, though, Stef was a quiet, introverted kid who was bullied a lot. For one thing, she looked different from her peers. Having been born with a rare genetic condition called Waardenburg Syndrome, Stef has several distinct physical features, including wide-set blue eyes and a natural streak of white hair.

But there was something else that she didn’t quite have the words for back then – something she felt closest to while playing as her favorite avatar in World of Warcraft, the massively multiplayer online role-playing game by Blizzard Entertainment. That something else was that Stef is trans.

Choosing your player is a near-ubiquitous experience in gaming. Whether it's picking from a stock of ready-made options in Mario Kart or carefully calibrating a custom avatar in World of Warcraft, a gamer's choice of character has a huge impact on the gaming experience. But when a gamer is given the chance to choose, or even build, a brand new identity outside of the one they experience every day, the potential impact goes far beyond simple gameplay.

"Hidden Levels" is a production of 99% Invisible and WBUR's Endless Thread. The Managing Producer for Hidden Levels is Chris Berube. The series was created by Ben Brock Johnson. Series theme by Swan Real and Paul Vaitkus. Series art by Aaron Nestor.