Billy (ビリー Birī) is a young man who looks like a typical delinquent, with a regent hairstyle. He is aggressive toward Jaguar and his friends, but is really a soft-hearted guy who's just lonely and friendless. He is Hamidento's guardian and tries to be a good father, but doesn't notice that Hamii doesn't appreciate it. Like Hammer, he strives to get attention but fails miserably. He is voiced by in the Drama CDs and OVAs Yūji Ueda.