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.