A red squirrel maid serving as an antagonist, who initially presents as hostile and dismissive, driven by deep-seated fears of being replaced at the hotel.

The badger proprietor of the Heartwood Hotel, characterized by his kind yet stern leadership and whimsical manner, who values protection, respect, and community.

A porcupine cook who acts as a nurturing and maternal figure, providing comfort and wisdom to the hotel’s staff and guests with her warmth and insight.

The officious lizard front-desk manager, proud of the Heartwood's reputation and strict in his adherence to its rules, often clashing with Mona's empathy-driven methods.

The hedgehog housekeeper known for her strict, efficient management of hotel logistics, whose illness creates an opportunity for Mona to work at the hotel.

A swallow with a broken wing who becomes Mona’s first friend at the hotel, transforming into a beloved resident entertainer through kindness and encouragement.

An elderly bear initially perceived as a threat, later revealed to be a gentle and confused creature, offering Mona a significant test of courage and empathy.

A pair of skunks, regular hotel guests who present a challenge with their high standards and propensity to spray when startled, showcasing Mona's resourcefulness.

A group of predatory characters who threaten the hotel, representing external danger and the lawless world outside the Heartwood’s sanctuary.

A June bug whose presence as a secretive reviewer for the Pinecone Press acts as a catalyst for change, highlighting the conflict between rules and empathy.

The hedgehog gardener who provides friendly support and resources, aiding Mona in solving a challenging situation with the Sudsburys.