Suguha Kirigaya is Kirito's cousin.
Suguha Kirigaya is created by Reki Kawahara who originally designed her as a flat chest character. According to the 6th "webradio@dengekibunko," Kawahara didn't care about the size of Suguha's bust. His editor suggests to Kawahara to change Suguha's bust size.
Suguha has black eyes and short black hair that has long bangs at the side. For her virtual persona (Leafa), she has long blonde hair tied into a ponytail and green eyes. Her outfit has a green and white scheme, and she has white pants under her green warrior skirt. Her bust is more revealing than her real self.
In the Q &A session of the 3rd popularity contest held by Reki Kawahara in 2005, Suguha's measurements are 82-62-81. According to Dengeki Fighting Fair Original Character Card, Suguha's avatar, Leafa, has different measurements, 85-61-88.
Suguha is confident when she is doing kendo and when she gets flustered with Kirito, she loses composure.