Cheddar Burns is a quiet and introverted cat who prefers to keep to herself. She is notoriously skittish and tends to run away when people try to interact with her, although she does enjoy watching people from a distance. Despite her shyness, Cheddar Burns is also curious and playful, and she often watches the other catchoo characters from afar, wishing she could join in the fun.

Choo-choo Bomb is always on the go, reminding everyone around them that time is of the essence. Thanks to their explosive nature, Choo-choo Bomb lives in the moment, making the most out of every opportunity presented to them.