The teacher is an unnamed adult male who teaches Connor, Greg, Amaya, Cameron, Marie and Jenny's class.
The teacher is open and caring of his students, and tries to give them a chance to learn and let their voices be heard. In "Speak UP, Gekko!", he encouraged Greg to continue his poem, despite laughter from the class. In "Owlette of a Kind," he thinks it's strange when things disappear. He is shown to be serious sometimes. In "Heroes of the Sky," he gets mad at Connor and Greg for causing trouble when they are helping Amaya regain her memory of being Owlette.
Since he is an adult, the teacher is much taller than his students. He has tan skin, short dark brown hair, and light brown eyes. He wears teal colored square glasses and a teal sweater vest covering a white and light blue striped shirt and a dark blue tie. He also wears dark blue pants with a brown belt.
His pajamas (which are seen in "Teacher Goes Ninja") consists of a pink shirt and pants, decorated with a strawberry-pattern. He also wears red slippers.