Antonio has a non-humanoid appearance in contrast to many other autonomous AIs. His head is a cylindrical-shape acting as a dashboard for Ophelia's performances. The main body consists of lengthy arms with prongs at the end, a curvy torso, and legs operating on treadmill-like wheels.
Antonio is Ophelia's partner AI.
- Antonio's name derives from "Antonio Salieri", a classical Italian composer, conductor, and teacher.