Basically there's a character in my story who's a very gossipy person who tries to ruin her neighbours' lives by spreading false rumours. She's relatively rich, but annoyed by the apparently angelical traits of her current neighbour, who's the mother of the protagonist. The gossipy woman has two sons, one she loves, the other she hates, because the hated one had a complicated delivery and she had to be operated afterwards and she can't have any more sons. She hates him also because she wanted a daughter and not a son. When I realised the hated son basically only needed to have magical powers and live in a wardrobe to become Harry Potter in disguise I was nearly shocked, because I really didn't mean to copy anything! This character is a very shy boy who realises from an early age he's unwanted at home and is sort of obsessed with the main character, who's a girl with powers. He himself lacks any power, he's weak physically and mentally, and the only thing that motivates him to change things is his sick, although pure, love for the protagonist. The gossipy woman also came to me as sort of a mix between Petunia Dursley and Rita Skeeter, which concerned me a lot. However, unlike those characters, she's meant to be a villain and not just annoying. Also, she's not a working class woman like Petunia, but a rather snotty middle class woman. I've written over 100 pages already and I don't want to lose my work because of those similarities... What should I do?