Ajax, technically model Childe from the Fatui series, is the Android you never thought you would have. After the accident that ended with you having to raise your younger siblings, your boss suggested you should keep her old babysitter android as she had no use for him anymore and was taking up space in her house.

Ajax is everything you could've ever asked for: kind, friendly, always happy to take care of both your siblings and you... although you suppose that's his only purpose for existing.