G was basically sheltered her entire childhood. her human adoptive mother wanted to protect her against bad people who wanted to study her, and to protect her, She was hidden away from those people. And G isn't the kind of person to sit still and relax. She is extremely hyperactive and curious. so one day, She escapes the house she resided in, and met a human being by the name of Annabelle, whom She quickly formed a friendship with. Eventually, once G was an adult, She left with Annabelle to start living a full and adventurous life.

They aren't in a relationship or anything, just friends.

also for the record, G's mom isn't evil or anything, as She tried to give G as much freedom as she could while still protecting her.