Gaia is based on the character of the same name from Greek Mythology.
Somehow, Gaia loses her physical form. After Mother Trudy is killed by the Black Fairy, they are reunited in spirit form. Sometime later, they are informed by Meagan that Regina Mills and her family have returned from Narnia. Gaia gleefully assures Trudy that they will soon reign over their world once more. ("Found")
Sometime later, Trudy and Gaia begin to enact their plan by having Gaia contact Meagan in her sleep. ("The Quiet Voice")
- Her casting call referred to her as "Tara" and stated, "Female. Late 40s to early 50s. A manipulative, power-hungry schemer, Tara's immense power has resulted in her being sealed away for several years. She will stop at nothing to reclaim what she believes is rightfully hers, even if it means betraying her own daughter. She's also a master of making deals."