Kirigaya Kazuto, born as Narusaka Kazuto, and known as Kirito in «Sword Art Online» (SAO), «ALfheim Online» (ALO), «Gun Gale Online» (GGO), «Project Alicization», and Unital Ring, is the protagonist of the main Sword Art Online series. Kirito described the appearance of his avatar at the beginning of the game and the beta-testing phase as having the appearance of a ridiculously handsome protagonist from some fantasy animation, looking noticeably older than he actually was. His in-game height was equal to that of his height in the real world to prevent the extra height from hindering his movements. In the full version of the game, during Kayaba Akihiko's tutorial, all player avatars were changed to reflect their real life appearances. After this change, Kirito's SAO avatar had slightly long but neat black hair and black eyes. His delicate face showed no trace of masculinity, allowing people to easily mistake him for a girl. Kirito's clothes later in the game consisted of black pants with a black belt that had a large silver buckle, a black V-necked shirt that was worn underneath a black trench-coat with gray lining going down the sleeves, and black boots with silver plates to protect his shins. He had a silver plate worn on the left side of his coat, and a pair of black fingerless gloves. He wore a strap that went over his right shoulder and under it to wrap around his left side. In the last months of the game, he used «Elucidator» and «Dark Repulser» as his main weapons. After being defeated by Heathcliff in a public duel and being forced to join his guild, Kirito donned the red and white uniform of the Knights of the Blood. At the beginning of Project Alicization, Kirito wore a hand-sewn pale blue short-sleeved shirt with a V-shaped cut on the chest which was tied with a light brown cord along with trousers and hand-sewn leather shoes. Two years later, after he became a valet in the Sword Mastery Academy, he wore the standard gray uniform, like all first years and non-elite swordsmen do. In the second year of the academy, after he became one of the twelve elite swordsmen in the academy and was allowed to choose a color for his uniform, he wore a pitch black uniform. Kirito's initial appearance was that of a default «Spriggan», which he chose because of the race's black-themed equipment. Instead of the normal black forelocks hanging from his head, his black hair stood in natural spikes. His large eyes appeared mischievous, his ears were pointy, and he had dark greyish blue wings. He was equipped with a large greatsword, intended for larger players, such as «Imps». On June 23, 2025, Kirito changed his previous spiky hairstyle into his old SAO style due to Yui complaining about it being hard to sit on the spiky hair. Later, he also acquired a new coat and switched his greatsword to a new long sword with an extra one in his inventory. On December 28, 2025, he obtained the «Holy Sword Excalibur», and used it as his second weapon when dual wielding but only in extreme cases, as he promised himself not to use the sword for personal gain. Kazuto's avatar in Gun Gale Online belongs to the rare «M9000» series. It is an avatar that many male players dream of having, due to its feminine appearance. Kazuto's avatar in Gun Gale Online is both shorter and more slender than his spriggan avatar in ALfheim Online. Although the two avatars share the same black hair and eyes, his hair now flows down to his shoulder blades, while his eyes are larger and shinier. The innocently bewitching gaze from his eyes, framed by long eyelashes, was so different from his previous avatar that Kirito himself momentarily forgot that he was looking at himself when he inspected his appearance for the first time. The avatar also has pale white complexion and red lips. These characteristics often allow others to confuse him as being female. This often causes great confusion to people, such as Sinon. He is equipped with a 5.7mm «FN Five-Seven» handgun and «Kagemitsu G4» photon sword. Kazuto is someone who is not good with words, as stated by Klein, and can be quite direct. This is due to him not having many friends and closing others off because of his love for computers. Thus, he can appear to be rude to others, such as Lisbeth and Sinon. Sometimes, he actually seems to enjoy angering and teasing people as well. Also, from time to time, Kazuto can be quite overconfident thinking he can do things others cannot. Kazuto is almost always a calm and collected character, rarely showing any signs of distress. When Kayaba Akihiko announced that Sword Art Online had become a Death Game, Kirito was able to quickly accept the new conditions of the game and take immediate action to increase his chances of survival. However, Kazuto is actually a kind person, willing to sacrifice himself to help others. When the death of Diavel during the 1st Floor Boss battle resulted in players accusing Kirito of withholding information as a beta tester that led to their leader's death, he decided to become a scapegoat by naming himself a Beater to distance himself from the average beta tester, ensuring that they would not become victims of unfounded hate by drawing all the ire of the players onto himself. He also tends to comfort others when they experience hardship, such as Silica after she lost Pina. Kazuto is also a very emotional person and lets his emotions control him from time to time. The deaths of Sachi and the Moonlit Black Cats had haunted him until his marriage with Asuna in Sword Art Online. Sachi's death, in particular, had a huge effect on his personality and motives, making him very distant from others for a while. Kirito also temporarily lost his will to live when Asuna was killed by Heathcliff. Kazuto is a person with incredibly strong resolve, willing to do anything and everything in his power to accomplish something that is important to him without any hesitation. When Asuna was being held in ALfheim, Kirito was bound and determined to set her free and immediately attempted to fly up World Tree when Yui confirmed that she detected Asuna being at its top, despite this being an impossible task. He also attempted to fight his way to the top by himself twice despite being annihilated the first time. After escaping Sword Art Online, Kazuto attempted to atone for his past mistakes, such as mending his relationship with his cousin Suguha, whom he had ignored before becoming trapped in the death game.