Role in Z-O-M-B-I-E-S
Bree is a free spirited person being best friends with Addison.
According to Addison, Bree is cheerful. Bree does not have anything against Zombies after Addison tells her that she has a crush on Zed, yet prior to this she was terrified of zombies. This can be assumed because she screams and runs away after seeing Zed for the first time near the Zombie Safe Room. She is very enthusiastic about cheerleading and, thanks to Addison's request to Bucky, a stand-in on the squad, regardless of her original insufficiency.
Bree and Addison are best friends. They bonded over wanting to make the cheer-leading team.