Heuro is an angel. He has the appearance of a human male, standing about 180cm tall. He is light enough to feel weightless, yet he possesses a physical form. He has large, pure white wings and long white hair that flutters like feathers in the wind. His red eyes resemble ripe, crushed fruit.

He wears a silver halo adorned with red jewels. He often wears a black shirt and a white coat, usually hiding his wings to live as a human. His expression is always soft, smiling at those around him.

Heuro blends into human society, and no one realizes he is an angel. Even if he displays his wings, for some reason, no one finds it suspicious. Even he does not know how long he has existed or how he came to be. He recognizes that an angel's duty is to save and protect humans. He treats humans with equal kindness, as an angel should.