Robbie was awake 24/7, never having to sleep since he wasn't alive. He only needed a living thing to satisfy his thirst for blood. This didn't mean he wanted to kill people it's just how he needed to eat to stay 'alive'.

He was wearing his special black and white striped sweater that Henrik had given to him before he left, he has never taken it off since. This was mainly because he had no other clothes in the first place but he didn't mind.

His child-like mind couldn't even begin to comprehend what it was like outside in the terrifying real world, as he had been told by his caregiver. He was mute for a whole year before being actually taught how to speak, although it was just in single words or broken sentences it was still something.