is a fictional character who appears in the Sword Art Online series of light novels by Reki Kawahara. She is more commonly known as , her player name in the fictional Alfheim Online virtual reality MMORPG in which the novels are partially set. In the real world, Suguha is the cousin and adoptive sister of series protagonist Kazuto Kirigaya (also known as "Kirito"); after he becomes trapped in the eponymous Sword Art Online video game in the series' first story arc, she starts playing a similar VR game, Alfheim Online, to better understand the world in which her brother is imprisoned. After her mother reveals to her that Kazuto Kirigaya is not her biological brother, Suguha starts to develop romantic feelings towards him but is later saddened after realizing his attachment to Asuna Yuuki. In the anime adaptation, Leafa is voiced in Japanese by Ayana Taketatsu and in English by Cassandra Lee Morris. The character has received mostly positive critical reception, with praise centered on her character development and portrayal. Appearances In Sword Art Online Suguha Kirigaya, also known as Sugu, is Kazuto "Kirito" Kirigaya's "sister" in the real world; she is in actuality his cousin, as her mother had been raising her sister's child from a young age, though neither Suguha nor Kirito knew about this until later. She is a diligent worker and has been practicing kendo for 8 years, partially to escape the loneliness and isolation in her life. After Kirito gets trapped in Sword Art Online, she begins playing Alfheim Online as a Sylph in an attempt to try to understand him better, and it is at this time that she finds out they are cousins rather than siblings; with her mother revealing to her that he is not her biological brother, but is actually her cousin and was adopted into their family when he was young. This causes Sugu to develop feelings for him that she doesn't really understand; however, because he is trapped inside SAO, she never acts on them. However, when Kazuto awakens after his two-year ordeal, those feelings return, but she realizes that he is already in love with someone else, namely Asuna. Coincidentally, she meets Kazuto's avatar, Kirito, in Alfheim Online after he saves her from an attack by player killers. Unaware of his true identity, she decides to help him on his quest to find somebody which eventually leads them