Shelley is a small but fierce tibbot. Like her friend Philo, Shelley has taken a liking to humans - at least human children. She has taken it upon herself to act as their guardian, often hiding in windows to protect them from the Unknown. She is slow to trust strangers and prefers to interact with children. She will often visit them near bedtime to ensure safe passage to dreamland. She will sometimes stay a few hours and explore. Shelley has contributed much to the tibbots current understanding of children.
Cal - whose full name is Calmund - is a bit of a toruble maker who enjoys making things difficult for humans. His favorite pastime is to steal thoughts from unsuspecting strangers. If he's bored that day, he may leave them out of reach rather than steal them outright. He can come off as jaded and callous, but he loves his home and wants what is best for everyone who lives there.