I can't stand stories where the heroine keeps getting bullied and insulted, then finally fights back but still has no bite. I want someone who strikes back as soon as she's offended. If she can't stand someone, she takes them down. If they annoy her, she kills them.
A pure villain, a lone wolf, ripping off others by selling them meat, milk, and cakes crafted with advanced technology and ruthless methods, all laced with laxatives, then followed by toilet paper. He'll buy super spicy food one minute and hemorrhoid medication the next, but it's not a complete cure, only temporary relief—a long-term business strategy.