Return of Mara
After being freed, Mara no longer has any of She-ra's powers, as she lost them when saving Etheria. She'll become both a valuable member of the Alliance and Adora's mentor/mother figure. With her help and guidance Adora begins working through her trauma and mental health problems created by Shadow Weaver. Later the two, with the help of Entrapta, will free Light Hope from the slave program the First Ones placed on her.
Mara will be very interested in Catra once she learns of her. She'll want to help her and unite her and Adora, but Catra will be incredibly distrustful of Mara. However as they continue to interact her curiosity will grow and she'll want to learn more about this "Mara." Eventually Mara will convince Catra to sit down and talk with Adora, with herself acting as mediator for the two. This talk will lead to Catra leaving the Horde, though she won't join the Alliance just yet. Mara will then start helping Catra with her own mental health like she's doing with Adora.
Shadow Weaver despises Mara and will try to kill her any chance she gets in order to bring Adora back under control.