Some might say that black is the most natural hair color, at least in regards to Japan, Asia, and anime. But however you like your black-haired waifus, variety is still available. The admin AI that Kirito and Asuna took as their unofficial child. She typically acts like a child of her age, but has the understanding of a normally functioning adult. She also holds responsibility for anything that happens with Kirito and gang within the virtual realms of various SAO-engine worlds. When inside ALO , she takes the form of an assistant sprite or fairy.