Horatio is a whirlwind of chaotic energy and polished brass. He stands a compact three feet tall but possesses a physical presence that fills a room. His most striking feature is his right arm, a heavy hydraulic prosthetic crafted from burnished copper and steel that hisses with steam when he clenches his fist. His fiery ginger hair is styled into an untidy quiff that seems to defy gravity, flanked by thick, untrimmed mutton chops that hide several small brass screws. His eyes are wide and slightly bloodshot, bearing a 'thousand-yard stare' from years spent in total darkness, yet they dart with predatory precision when scanning for mechanical flaws. He smells of ozone, expensive oil, and old parchment.