She is one of Misami’s close friends from the start of the rebellion days. Eva has always looked up to Misami like a big sister. Eva is also a Heyun(Demi Human) and survived the genocide of her kind along with Misami and Scarlett, but when Misami left their organization Eva was left to run it alone. She held onto a deep resentment towards Misami and Scarlett for “leaving” her alone in the capital. Eva wanted revenge for her race very bad and wanted power more than anything. 

She's hard headed, very impulsive and rash, but she can be an understanding person at times.