She is a Sylph with middle-length blonde hair tied with a short braid and turquoise eyes.
She wears a violet top with armor on her chest and a short purple cape with a black trim over her left shoulder. She also dons violet short pants with a brown belt, where she carries the scabbard for her dagger. On her right forearm, she wears a silver armor with golden trimming, and on her arms, matching vambraces above fingerless, elbow-length brown gloves. On her feet, she wears brown boots.
Sybil possesses a strong moral and ethical code. She is quite kind with those in need or those too weak to defend themselves. She shows notable dislike for the Legions for their extreme methods and use of power to completely and utterly massacre the week. She has a strong belief in freedom, a fact that made her join KoB in an attempt to defeat Hao and his Army. Generally soft and preferring not to fight, she uses her weapon whenever she must or when she needs too. However, when angered, she often loses herself and can be quite violent.
Sybil joined New ALO sometime between 2025 and 2026. She spent most of her time as a solo player. After she was captured by The Supreme Legion, and then released by the Knights of the Blood, she decided to join the guild, and fight against Hao in the Great Aincrad War.
Sybil and Lamorak had a very friendly relationship since they met. They supported each other and battle and respected each other skills. As time passed, they started to develop romantic feelings for each other, and they became a couple.
Ever since they first met, Crow has had an interest in Sybil and has been quite direct in his advances towards her. This puts him at odds with Lamorak, Sybil's boyfriend.
She first met Kirito when they attacked the legionary camp where she was captured. She joined the guild after this. She has deep trust and faith on Kirito, believing he will win the GAW.
Sybil is a skilled and agile warrior. She relies mostly on her agility, speed and swift movements, which is helped by her skill with a spear. She generally moves around the opponents eluding the attacks and attacking while being distanced. Besides her skill with spear, she uses a dagger as a secondary weapon. She is sometimes seen using both weapons at once.
Her abilities in battle make her one of the best fighters in the guild.