Character: Kirito

The main protagonist of the series. He is the protagonist and is a "solo" player, a player who hasn't joined a guild and usually works alone. When it is announced that the players of Sword Art Online can no longer logout, he is surprised like everyone else, but unlike everyone else he quickly gets over it and accepts it, to an extent. He mainly uses a one-handed sword and usually wears all black in game, as it adds to stealth. He can also use two blades at once, a unique skill to him and he only uses it in emergencies to avoid attention for being one out of the two people to have unique skills. His game alias is Kirito, which is created by taking the syllables of the first and last Kanji of his real last and first names respectively: (Kirigaya Kazuto). In the real world, he lives with his mother and younger sister in a family of 3.

Kirigaya Kazuto, who uses the portmanteau "Kirito" as his character name, is a "solo" player who has been branded a "beater" (a combination of beta tester and cheater) by the players in Sword Art Online. When Kayaba announces that the players of Sword Art Online can no longer log-out without clearing the game, he quickly overcomes the shock. He power-levels to improve his odds of survival in the game, and emerges as a frontline floor-clearer known as the Black Swordsman. In SAO, he is the sole «Dual Blades» skill user. During his time in SAO, he falls in love with a female player, Asuna, and even marries her in-game.

Source: Wiki

Kirigaya Kazuto's first avatar in SAO. Was changed to his real appearance by special mirror item prepared by Kayaba Akihiko.

Kirito as shown in Alfheim Online as Spriggan Fairy.