Captain John Hart runs on passion. Lust, pleasure, first and foremost sexual but thriving just as much on lie, cheat, manipulate, fight, kill, fuck. Sword, guns, boots, swagger, big mouth, cheekbones. Drop-to-your-knees-and-worship gorgeous, and he knows it. You know he's a killer and you just couldn't care less.
The only thing that motivates him beyond passion is love. When he loves he loves with all his heart, and when it gets broken he's merciless. There's precisely one being in the known universe who broke John's heart and lived to tell.