Apple is a bluebird that has been with Chip, Jay and Gillion since the early days of their adventures. She is constantly flying nearby and often perching on Gillion or Jay.
After arriving at Allport and meeting Amber, she revealed that Apple was under the effect of transmutation spell. After the Feywild, Celestine let the crew know that the spell had been cast over a 100-year period and gave them a vial to turn her back.
In Episode 83: All Hands on Deck, the transmutation spell was lifted (see status).