Borealis Datoura, age 16, a harpy posing as a human- ends up being quite the source of trouble for the protagonist. He's a pompous person, who often acts entitled and as if he has superiority over those around him, not just because of his status as the Datura kingdoms heir, but because of the privilege he has had to learn so much so young. He's often burdened by how much knowledge he was basically forced to acquire at a young age, and he wished his brother never left him behind. He's rival to Ulysses, someone who offers a distraction to the heavy weight he feels he carries on his shoulders at times.

He's a snarky and 'know-it-all' kind of individual, He put's others down because it gives him the ability to avoid his own flaws passionately. He sounds 'sophisticated' in some ways however and he makes a point to be unsympathetic. He presents himself as to be a very proud individual.

His voice is seen to be mid-high pitched.