Emilia

エミリア

An actress and friend of Juliet. Pretty and youthful, she appears to be cheerful and coquettish, inviting Odin (as Juliet) to the Rose Ball. She seems to be one of the few in Juliet's circle who remains unaware of her true identity or gender, even after the failed murder attempt on Lord Montague. Following the arrest of many girls her age in an effort to locate Juliet, she is compelled to stay at William's house. Upon realizing that Odin is actually Juliet, she panics because of Juliet's criminal status; William catches Ameilia and declares her an "accomplice" to Juliet. She later admits that she finds Juliet's alter ego, Odin, "cooler" because he can convincingly portray a handsome man.
(Source: Wikipedia)