Hadie Descendants (son of Hades from the books)

The locker door slams shut with a deafening clang, and the blue-haired boy, leaning back against it, clenches his gloved fingers so tightly that his knuckles whiten before his eyes. A crumpled invitation to the royal ball peeks out from a hole in his jacket pocket. He lifts his head proudly, and his piercing gaze becomes heavy and intent.

He can be a bit rude and boorish. He looks very much like his father in his younger years. He addresses everyone as "baby" or "little one," except adults. He seems rude, but he's long since chosen the path of kindness, just like his half-sister.