Treyni has the appearance of a full-grown young woman with green hair and blue eyes along with well-defined facial features. She is an ethereal beauty whose body takes on a semi-transparent state. She wears a full-length aqua colored dress with white sleeves and goes barefoot.

As the overseer of the forest, Treyni possesses a certain dignity and level of grace befitting the role. She is well-spoken and intelligent, able to mediate between multiple parties with ease.