The following is a list of characters from the light novel, anime and manga series Sword Art Online. Most of the characters are introduced as gamers who play and consequently become trapped in a virtual reality massively multiplayer online role-playing game (VRMMORPG) Sword Art Online. The series chronicles their interactions in multiple online worlds: Sword Art Online (SAO), Alfheim Online (ALO), Gun Gale Online (GGO), and Underworld (UW).
Sword Art Online has an extensive cast of fictional characters. The series focuses Kazuto Kirigaya as he attempts to clear and explore the virtual world of Aincrad in the VR game, Sword Art Online. He is accompanied by Asuna Yuuki, and they work together and support each other as the series progresses.
As the main protagonist of Sword Art Online, Kirito was chosen to be one of the one thousand beta testers for the closed beta of Sword Art Online, the first ever Virtual Reality Massively Multiplayer Online Role-Playing Game (VRMMORPG) for the NerveGear, and later joined the official version of the game where he became one of the 10,000 players trapped in Sword Art Online. During the start of SAO, he befriended a girl named Asuna. During the 1st Floor Boss, as Illfang the Kobold Lord's weaponry and attack patterns differed from the beta, while the raid party relied on Argo's published beta test version of information about it, Diavel was killed by the monster while attempting to obtain the Last Attack bonus. Because of this, the hatred for beta testers resurfaced and threatened to go out of control. Kirito decided to end the tension by claiming that a majority of beta testers were inefficient and incapable players, while only a select few of the beta testers like himself resulted the creation of the category Beater and Kirito remained a solo player for the majority of the game. For being the first player to defeat the 1st Floor Boss, Kirito received a black leather trench coat that becomes his trademark appearance for the rest of the series.
During the time Kirito spent in SAO, Kirito joined a guild named the Moonlit Black Cats, but he kept his character's level a secret, which resulted in the entire guild being killed by monsters, which led to Kirito wallowing in his despair and self-loathing until he read the time delayed message Sachi left for him on Christmas Eve. This event kept Kirito from joining another guild. Kirito befriended a girl named Silica and helped her revive her pet Pina. Later, Kirito met a blacksmith named Lisbeth, who forged a new sword for Kirito after he unlocked a unique skill: Dual Blades, although he kept it hidden to avoid attention. However, he was forced to reveal it during 74th Floor Boss fight in order to save the people nearby as they couldn't leave by teleport crystal and defeating the boss. Later he was forced to join the Knight of Blood Oath after the revelation of his unique skill and accepted the duel against Heathcliff for allowing Asuna to go with him and lost. Later, he realizes he is in love with Asuna, who returns his feelings, and they marry in-game. Later, Kirito exposed Heathcliff as Kayaba after the 75th Floor Boss. He faced him in a one on one duel with a condition; to allow every player to logout if Kirito wins, and manages to defeat him ending SAO with a total of 6,147 survivors.
Despite the completion of SAO, Asuna remains unconscious and Kirito learned from Agil that Asuna is trapped in another virtual reality called Alfheim Online. Logging into Alfheim Online to rescue her, where he meets a player name Leafa, who is unknowingly, is his younger sister Suguha; who agrees to guide him to the head toward to the top of the giant World Tree, in order to get to Asuna. Arriving there and tried to get to the top of World Tree, but rescue by Leafa where he soon learns Leafa's identity as Suguha where Suguha reveals her feelings for him in the real world. Not knowing how to respond or comfort her, Kazuto tells her he will be waiting for her in game. When they meet up they engage in a fight which culminates with both of them letting down their guard expecting the other one to kill them, however that only leads to them hugging and apologizing to each other. Leafa lets go of her feelings for Kirito and after pulling herself together Leafa helps him rescue Asuna from the top of the world tree.
Eventually Kirito manages to reach to the top of the World Tree and see Asuna again where he was confronted by Sugou going by Oberon, binding them both with gravity magic. Oberon then stabbed Kirito with his sword, and then critically damaging Kirito by increasing Kirito's pain limit and impaling him. When the consciousness of Akihiko Kayaba reminded Kirito how he was defeated by Kirito's determination and give him his admin ID and password and remove Sugou's GM status, Kirito then blinds and dismembers him after setting Sugou's pain limit to the maximum declaring the pain was much more painful in SAO compared to ALO. After rescuing Asuna, he soon receives a program from Kayaba called the World Seed which revitalizes the VRMMORPG genre, after Kirito has it upload by Agil on the Internet.
Several months later, Kazuto is recruited by Kikuoka to investigate a serial killer known as Death Gun, a "player" in the game Gun Gale Online. GGO players are being killed by him in the game, which has led to their deaths in the real world. Kirito enters GGO and meets Sinon, who believes he's a girl due to his avatar, but she later discovers his true gender. Despite so, she continues to help Kirito prepare for the next Bullet of Bullets, which is where Death Gun is subjected to appear. However when the two first meet, Kirito discovers that Death Gun is a former member of Laughing Coffin. The BoB began, and Kirito learns of Sinon's past. After most of the other players have been taken out, Kirito and Sinon team-up to devise a plan to take down Death Gun. Kirito deduces Death Gun's method of killing and faces him in a battle, winning. He warns Sinon to be careful as he logs out. Once he did so, he rushed over to Shino Asada's (Sinon's real life identity) house and saves her from the Death Gun killer on the reality side, Kyoji Shinkawa. The two reconvene with Kikuoka, who then also discover that there was one last person in the Death Gun group: Atsushi Kanomoto, otherwise known as Johnny Black, and the last known surviving member of Laughing Coffin.
Later, Kazuto agrees to work with the company Rath in testing out their new full-dive system, the Soul Translator. The STL reads the Fluctlights in the human brain and transports them to a highly advanced AI world, the Underworld. In the Underworld, Kirito has no memories of reality while he dives, and cannot take any memories with him when he exits. After explaining the job to Asuna and Shino, he asks Asuna to go to America with him in an effort to witness the true embarking of full-dive technology, which she agreed. However, they are ambushed by Johnny Black, who puts Kirito into a coma. After being diagnosed with brain damage, Kazuto is taken by Kikuoka and the Japanese government to the Ocean Turtle, a base out at sea run by Rath. There, they put him into a dive into the Underworld with his memories of reality intact in order to buy them time for them to treat his brain damage.
In the Underworld, Kirito grew up with his best friends Eugeo and Alice, and both him and Eugeo were tasked with the calling of cutting down the Gigas Cedar. However a trip to the End Mountains, resulted in Alice touching the Dark Territory, breaking the Taboo Index. Alice is subsequently taken away, and Kazuto awakens in reality. When he returns after his attack, he has his memories from reality intact and meets Eugeo. He helps Eugeo cut down the Gigas Cedar and the two depart for the Central Cathedral, where they both enroll in the Swordsman Academy in North Centoria. Several months in, the two prevent a rape on their pages and kill their abductors, which causes them to break the Taboo Index. The two are imprisoned, but escape and are saved by Cardinal, who gives them the skills and knowledge they need to take down the Integrity Knights, defeat Administrator, and fight the impending invasion by the Dark Territory. The two trek their way up the tower. They defeat Deusolbert, the Integrity Knight who took Alice away. They outsmart Linel and Fizel, the two youngest Integrity Knights. After defeating Fanatio, the two finally meet Alice, but Kirito and Alice are separated from Eugeo. After making his way to Quinella, Kirito is forced to fight Eugeo who had been corrupted to becoming an Integrity Knight. Kirito defeats him and returns him to his senses. However after a long battle with Quinella, Eugeo dies in Kirito's arms. Quinella attempts to escape to the real world by summoning a console that can contact Rath, but Chudelkin appeared and took her down with him, and they both perish. Kirito uses the console to contact Rath, but Rath was under attack, and Kirito's fluctlight became damaged.
Alice returned to Rulid Village with Kirito after the battle with Administrator, and took care of him. She notes that it was because of him, she hung up her sword. After the Dark Territory had begun their plans to attack the Human World, Alice is forced to go back to the front lines and took Kirito with her, leaving him in the care of Tiese and Ronye, who are both devastated to hear of Eugeo's death. He is later found and attacked by PoH during the Underworld War, but the memory fragments Eugeo left behind to him caused his fluctlight to be restored. Now awakened, Kirito forcingly logged out the remaining foreign players attacking Underworld and defeated PoH before going out with Asuna to rescue Alice.
Despite the completion of SAO, Asuna remains unconscious and is instead detained in another virtual reality called Alfheim Online. She is forced to play the role of Titania the Queen of Fairies, with Nobuyuki Sugou, the man responsible for imprisoning her, playing as Oberon, the Fairy King. This is done so that Sugou could marry Asuna in the real world, while she is unconscious and thus take over RCT Progress Inc. She attempts to escape the World Tree where she is imprisoned and manages to steal a GM card, and is caught, and sent back after two slime guards verify she is the captive. When Yui's voice is heard, she throws the GM card down to her. Upon being released, she creates two avatars for Alfheim, Asuna (the Undine Healer) and Erika (and the Sylph battle character), and went on to continue living together with Kirito. She enrolls at the SAO Survivor School with Kazuto Kirigaya in the real world after everything ended. In the real world, Asuna's parents want her to follow in their footsteps. However, after living in SAO and meeting Kirito, she gains a different perspective and looks back on her past with disgust. She officially becomes Kazuto's real-life girlfriend and dreams of marrying him and having a family with him in the future.
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