Livy is a logical ten-year-old girl visiting her grandmother in Australia. She suffers from a mysterious lack of memory regarding her visit five years prior, which complicates her discovery of a green creature in her childhood bedroom closet. Kind and determined, Livy is deeply committed to fulfilling a forgotten promise to help her new friend find his way home. She struggles with separation anxiety when apart from her parents but tries to be brave during her stay.

Bob is a mysterious green creature who has spent the last five years waiting in a closet for Livy to return. Despite his unusual appearance, he possesses many human traits, including a love for reading the dictionary and an affinity for human snacks like licorice and potato chips. He suffers from amnesia regarding his own origins but remains deeply loyal, resilient, and hopeful that he will find a place where he belongs.

Gran Nicholas is Livy's grandmother who lives on a farm in Australia. She is eager to reconnect with her granddaughter after a five-year absence. Caring and observant, she sets out familiar objects to trigger Livy's memory while quietly dealing with her own financial stresses tied to the local drought.

Danny is a young boy living near Gran Nicholas's property whose family is severely impacted by the ongoing drought. He is a sensitive and imaginative child who deeply cares for his grandfather's struggling farm. Known for his artistic talent and belief in fairy tales, Danny's observant nature makes him an important figure in the local community.

Sarah is a local Australian girl whose memories of Livy's visit five years ago are much sharper than Livy's own. She is eager to rekindle their childhood friendship and often attempts to draw the cautious Livy out of her shell. Her clear memories of the past make her a potential source of clues about what happened during Livy's first visit.

Livy's mother is a caring parent who tries to help her daughter feel comfortable in Australia despite Livy's separation anxiety. She plans to leave Livy in Gran Nicholas's care while visiting friends, unaware of the magical occurrences happening in her childhood bedroom.

Gran's neighbor is Danny and Sarah's grandfather and a local farmer. He is deeply affected by the town's severe drought, facing the looming threat of losing his farm, which causes visible distress to his family.

Sarah and Danny's mother operates the local restaurant in Gran Nicholas's small town. She is a friendly community fixture who fondly remembers Livy from her visit five years ago.

Beth Ann is Livy's baby sister. She travels with Livy and their mother to Australia so Gran Nicholas can meet her for the first time.