40. Yui

Anime: Sword Art Online

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.

Her black hair, fittingly enough, makes her look even more convincingly like Kirito’s actual daughter.

Well, in principle anyway.