Harry Potter: What If Dudley Were a Witch

Harry's cousin Dudley becomes his cousin Lucy. Dudley is a Muggle; Lucy becomes a witch. The transmigrated Susan brings a butterfly effect. A Slytherin Savior? Harry goes dark... Dumbledore gets bashed. The two generations of Dark Lords return... Our goals: pin down the Dark Lord, bash old Dumbledore, tease the professors, and take little Harry for a walk. If you don't like powerful protagonists, stay away. The heroine is no Mary Sue, and she's no naive little white flower. She's strong-willed, has transmigrated several times, and is fiercely protective of her own. I'll admit I gave her a golden finger now and then, but she isn't omnipotent. By the way, I don't care for the Marauders, the Order of the Phoenix, or old Dumbledore, so I'll be putting them down. Of course, I'll try not to distort their characters, and I won't torture anyone for no reason. Also, I love the professor's deep devotion, admire the Dark Lord's charisma, and think the platinum-blond father and son are adorable, so the male lead hasn't been decided yet.