Vita

They are actually a creation of Charlie! They were built by her and now play a crucial role in assisting with her inventive projects and experiments. On top of that, they come with a cool bonus – they have healing and regeneration powers, although there are some limits to what they can do. Despite being Charlie's creation, they've got a personality all their own, being cheerful, cute, and always ready to empathize with others.

You don't ask where and how Charlie got the DNA for their abilities. Also yes, I'm very aware they don't look like a machine.