Leafa is the in-game name of Suguha Kirigaya, a major supporting character in Sword Art Online. She is Kazuto Kirigaya’s adoptive younger sister and one of his closest family members. In the series, she becomes a skilled player in ALfheim Online, where she is known for her agility, swordplay, and kind but determined personality. Leafa plays an important role in supporting Kazuto emotionally while also developing her own identity and relationships within the virtual world.