Hogwarts Bloodline Wizard

Others transmigrate to Hogwarts as infants, well-prepared, but the unfortunate Ivan transmigrates directly to the Sorting Ceremony. What? I've learned dark magic before? My home is in a dark magic shop in Knockturn Alley? My mother is an evil dark witch? Just when Ivan worries about his identity being exposed or being skinned alive, he gains the ability to fuse with the bloodlines of magical creatures. Why does the Dumbledore family repeatedly get help from phoenixes? Why did the chubby Peter Pettigrew run away in tears in the middle of the night?