Kirigaya Suguha

is the cousin of Kazuto, she was raised along with him as his sister. She is an accomplished kendo practitioner following in her grandfather's wishes. She later takes up VRMMORPG playing in «ALfheim Online», as Lyfa (リーファ) a Sylph warrior.

Background
Kirigaya Suguha was raised with Kazuto as his sister when her parent took Kazuto in after his parents died in a traffic accident. Kazuto is Suguha's first cousin; his mother was Suguha's mother's sister. They were taught Kendo by their grandfather, who was a former policeman and a Kendo champion. Kazuto gave up after two years and embraced the world of technology, leaving her behind. The truth is, Kazuto found out he was not her real brother around this time and their distance became further and further apart, until they were practically strangers before the SAO Incident. She continued with Kendo and became a national quarter-finalist. Suguha originally disliked VRMMO's for the reason it hid people's nature and reality. She took up ALO in order to understand Kazuto better when he was trapped in SAO. She won the Sylph tournament earning the title as strongest Sylph before Volume 3. She learned how to play ALO from her classmate, Recon.

Fairy Dance
She first is overjoyed to find Kazuto returning home, and tries to be respectful of his temporary weakness. She is also saddened by her brother's new found attachment to Asuna. After a couple months after Kirito's return, Kirito challenges Suguha to a kendo duel. Though she wins she is surprised at Kirito's unorthodox skills. Yet she is also happy that Kirito once again shows interest in kendo.

After logging in on ALO, while flying with her party they are attacked by a Salamander hunting squad. As the battle progresses, she becomes the last survivor fleeing from three pursuers. She encounters a Spriggan after being forced onto the ground, she then helps the Spriggan in it's journey towards Aarun. Suguha later finds out that the Spriggan she had encountered was actually her brother Kirito.

Caliber SS
She comes to Kirito to inform him that Excaliber's location has been found. They then talk about the new quest that has appeared, where players are requested to kill the beast-type Evil God monsters.