Moldy Voldey Was Once A Girl

The Start

Once there was a little girl called Thomasina.
She hated her name more than anything else in the eighty-seven universes, and, being a Tomboy... (get it?) changed it to Tom, which was easy because everyone called her that anyway, and her parents were dead, so they couldn't object. (We'll get into the dead parents later.)

On the day she changed her name, she ran away from Wool's Orphanage; the place she grew up in, and went to Kings Cross Station, where she tripped and went flying into -and surprisingly through- a random wall.
She then boarded the nearest train (the Hogwarts express) and waited. When she got to Hogwarts she saw a big pile of bricks and debris that made up the ruins of a castle. She was so disappointed (and bored, it was a long train ride.) that she started blowing things up... again. (she had a tendency to do things like that.) Dumbledore apparently couldn't stop her, so he had to quickly take the enchantments off the castle and let her in.
She soon got a new wand and other magical equipment, and she found out that Muggles could learn magic if they tried. (Or, ya know, she was a witch.) For some reason no one but Dumbledore noticed, and we all know how he is about these things. (Strange things happen at Hogwarts don't question me.)

After 6 long years at Hogwarts she decided that she wanted to be immortal (as normal people do), so she asked the nicest *cough* most gullible *cough* teacher in the school to help.
Professor Slughorn said that the only way to become immortal was to make a horcrux. She asked how, and he told her that if she wished to make one she would have to do the "hardest" thing ever: changing her gender. (The wizarding world is very backwards, yes I know.)
The problem with the "hardest thing ever" reasoning was: just because the maker of the horcrux spell liked how they were, they never thought that anyone else would want to change their gender.
Tom was happy, because she had always wanted to be a boy, hence the change of name, so she did it and made the horcux. But in her last year, her horcrux was destroyed (gasp!) and she was forced to change back. She somehow didn't notice though (???), and went on with her life.

Then, 20 years later, she had a child. She named him Tom, after herself. She died shortly after, but, she cursed him to take her mind, and they merged into one.
Tom jr. went to Hogwarts and became eViLlLl, and he (or she) started calling himself (or herself) Voldemort. Then they died at the hands of Harry Potter... OR SO THE WORLD THOUGHT!
Dun dun dunnnnn

A/N: yup, my grammar is atrocious, I know. DEAL WITH IT. Love ya.