Ellie Kemper, Erin
Erin comes to the Dunder Mifflin team while Pam is on maternity leave, and is a less-than experienced receptionist. She starts dating Gabe, then later falls for Andy, and then later falls for Pete. She also has a mysterious past regarding her adoptive mother, with whom she is reunited with at the documentary's Q&A session.
She's Unbreakable
Kemper's other most successful role was in The Unbreakable Kimmy Schmidt, which followed her character after she is rescued from a cult leader's underground bunker. She then has to assimilate back into society, and the result is intensely hilarious and heartwarming. The show also helped launch Titus Burgess's career.