Doppio is a younger version of the boss, more innocent and eccentric. Being a part of Passione, he considers himself the most loyal subordinate of the boss. But in fact, both of these personalities are one person, in which there are two souls. Doppio appears as a rather thin and muscular young man (described as having the physique of a man in his late teens) with a neck-length tail tied back, either a complicated braided braid or a hair clip.