Kirigaya Suguha is the cousin and adoptive sister of Kirigaya Kazuto. Suguha was raised along with him as his sister. She is an accomplished kendo practitioner, following her grandfather's wishes.
Unlike her cousin Kazuto, Suguha is upbeat and outgoing. She is much more social and converses easily with others. Even when Kazuto began to push her away after finding out they were not really siblings, she still treated him with good spirit and tried to get back in his life. She can be very aggressive towards those that annoy her or cross her and can easily lose her temper. This is demonstrated in one case when Recon attempted to kiss her after confessing his love to her and she punched him. Despite treating Recon most of the time with annoyance, she cares for him as a good friend, although she does not seem to return his feelings. She did, however, say she enjoyed seeing "this side" of him when he confessed, and was shocked and motivated by his sacrifice at the battle at the World Tree.
Despite her positive outlook and slightly aggressive behavior, Suguha can be somewhat fragile and delicate due to her young age, especially when her cousin, Kazuto is involved. After seeing Kazuto in a comatose state due to being locked in SAO, she broke down crying for the first time in years. In addition to this, once she found out that Kirito and Kazuto were the same person, she locked herself in her room away from her cousin and went into a slight depression. Most of the time she is quick to rebound from these moments and return to being the same upbeat girl. She is also, besides Asuna and possibly Sinon, the only girl Yui will allow to interact with Kirito, most likely because the two are family. She also developed romantic feelings for her cousin, Kazuto. [Source: wikia]
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