Alastor

An agent of the Jadow that uses the nicknames "The Midnight Thunder Boy" and "Blade Master." Though he was helping the Jadow, Alastor doesn't care about their goals, but instead seeking out the ultimate battle, and can be considered an "anti-hero" to an extent. He considers himself Joe's rival, despite questioning Joe's methods. Alastor was also the one who gave Joe the inspiration for his "hero name." During Fire Leo's fight with Joe, Alastor restrained Fire Leo as they both fell into the void that surrounds Jadow headquarters, but Alastor promised to survive so he and Joe can finally settle their rivalry. He was supposedly created from the sword of Dante the Devil Hunter from the "Devil May Cry" series