Xuelan has purple eyes and long black hair that is tied in a ponytail with two strands on either side of her face. She wears a white one-piece outfit with gold designs, a black waistband, black tights, and red shoes. She sometimes wears a fox mask to conceal her identity.
Xuelan is capable of dealing with herself in tough situations and is confident in her abilities. As a member of a clan of assassins that has existed for 2000 years, she is looking for an heir, whether that is accomplished by teaching someone assassination or bearing their child. Since meeting Kaname at the Danjou Boxing Club arena, she's taken an interest in him, considering him as a candidate to be her husband and offering to bear his child. She doesn't like dwelling on decisions for long and states that she only takes home results.
Sigil: Xuelan has a currently unknown sigil. Even with her fame, no one knows what it is.
Expert Assassin: As a member of an assassination clan that has existed for 2000 years, Xuelan is highly skilled in assassination.
Killing Intent: Xuelan is able to project her killing intent at people to incapacitate them by showing them their "death". Opponents can withstand this if they aren't afraid of death like Shuka.
High Strength: Xuelan is able to create a clean hole through a reinforced window by stabbing through it with a blade.
Equipment: Xuelan is shown to use a jitte in combat, which she used to effectively deflect Shuka's chains. She also carries small metal balls that she can flick at people at high speed and strength. She can flick them fast enough that Rein cannot react to her even with Laplace.