Stefan Bayless is a pre-made playable young adult Sim who lives in Lunar Lakes with his romantic interest, Anais Willheim. Stefan works in the Music career. He is at level one and works as a fan, but he is lacking any points in the guitar skill. Instead, he has one skill point in handiness. He carries a guitar, a book and a stereo in his inventory. He is good friends with Arthur Langerak and Sofia Vanderburg; friends with Gloria Goode, Gretel Sekemoto, Len Sekemoto, Carlos Mosqueda, David Karstark, Amelia Loveland, Franco Wolff-Cruz and Violet Logan; distant friends with Doris Lucas and Lars Royal; he is acquainted with Pax Louie, Damien Su, Patricia Cross, and Alexander Cross.
Stefan is 20 days away from becoming an adult. He is implied to be related to Bayless family from Twinbrook because of his appearance, surname and because Lunar Lakes was founded by people from various neighborhoods.