You were chosen by part of your ‘great power,’ you know.
- —Celine, Trails of Cold Steel II
Celine is a black cat that Emma smuggled in when she first entered the military academy. An elegant creature sporting beautiful fur, for reasons unknown, she can speak in human tongues. In actuality, she isn’t Emma’s cat, but rather an overseer of sorts, one who appears before Rean from time to time to test whether he had the ability to become an Awakener. She reveals her ability to speak to Rean and his classmates during the Imperial Liberation Front assault on Trista, and informs Rean on how to summon Valimar. She boards the Ashen Knight Valimar along with Rean and they engage in a major fight with the Azure Knight Ordine, only to be utterly defeated by it. With Valimar damaged from the fight she orders it to withdraw from the battlefield against Rean’s wishes.
Following Rean's re-awakening, she speaks with him openly and helps him to understand more about his status as an Awakener. She also begins speaking openly with the party as they're found, but sometimes may still remain secretive at times.
As a cat, Celine can sometimes seem aloof, but also has a soft side. She is very attached to Emma, but has difficulty expressing it aloud. Like most cats, she is not fond of dogs. She often speaks mysteriously, encouraging the party to find certain things on their own. Sometimes, however, she must admit that there are certain mysteries of which even she is not aware of the answer to. She does not seem fond of the church of Aidios, once expressing displeasure at the idea of a prayer service.