A great horned owl who maintains control over the forest's creatures, particularly the mice, through fear and intimidation. He is a formidable and antagonistic force in the story.

A porcupine with a gruff exterior who becomes an invaluable friend and ally to Poppy. His insights help her see things from a different perspective during her journey.

Poppy’s bold and unconventional boyfriend who influences her thoughts and actions even after his untimely death. He encourages Poppy to question authority and seek freedom.

Poppy’s father, who leads Gray House and upholds the existing social order. He is portrayed as supportive of Mr. Ocax's authority over the mice.

Poppy’s nervous and passive mother who does not vocally challenge the influence of Mr. Ocax. Her demeanor contrasts with Poppy's growing courage and resistance.