Very little is known about Eris. Eris seems to be a ominous presence within the world of Astrum, as when Yuuki and the others defeat Mana Senri, she warned them that "`the menace she was working to destroy`" is now their problem, likely referring to her as she was observing the entire battle. Eris seems to hold some sort of fondness for Yuuki, as she has been shown to mainly observe him. This is later further proven when she finally meets him, where Eris embraces Yuuki after defeating the others