A young tree spirit girl who lives in a plant-filled greenhouse under a tree. Despite being a few hundred years old, she looks around 16. Being a tree spirit, she has the ability to speak and listen to plants and to traverse the forest easily.

Airi has reddish-pink eyes and long, messy coral pink hair with two clumps of hair tied into small fluffy pigtails near the top of her head. She has rough spots of skin like tree bark and pointed ears. 

Her mom is a tree and her dad was a lumberjack.