* Uncle Jed: Essie's kind and wise uncle, who teaches her about the art of keeping cool and shares stories of his own adventures.
* Aunt Em: Essie's loving and supportive aunt, who helps her to stay cool and comfortable during the hot summer days.
* The animals of the forest: Essie meets various animals in the forest, including a wise old owl, a playful squirrel, and a gentle deer, who all teach her valuable lessons about nature and the art of keeping cool.