Polly's biggest struggle - her gender identity. Of course, Bonnie can sympathize thanks to his name and often being mistaken for a girl, but his loyalty is to Chica first and the new bird second. Chica isn't very happy to have another bird (and another girl) taking the spotlight from her pizzas.
Polly (c) Me
Bonnie, Chica, and FNaF's (c) Scott Cawthorn