Warnings:
FemHarry is Sephiroth, AU
Summary:
When Hojo found an abandoned baby he was ecstatic, he had a test subject and no-one could stop him. He found an anomaly in her blood, similar to the Cetra gene so when he injected the female baby, he was surprised to see they didn't affect her much, other then changing her her to silver instead of black, and cat slit pupils instead of human ones. To make her more proficient in the field of combat and the mind, he injected her with cells from Vincent Valentine, making her his daughter, despite how much he hated to do it.
When Sephiroth was seven, Hojo made her go with a group who where taking Jenova to Nibelhiem and she ran off. She found Cloud, who was five, being picked on by bullies and helped him, before he takes her to the Shinra Mansion, where they explore and they find Vincent, who they convince to come out of his coffin.
Sephiroth takes Vincent back to Midgar with her after promising to write to Cloud. Vincent sneaks into the Turks office and explains what happened to Veld. Veld then sets Vincent up in a safe house in the slums. Sephiroth convinces Cloud to move in with Vincent after his mother dies, and Cloud and Sephiroth get Turk training from Vincent, who introduces them to the other Turks. They also find out that Vincent is Sephiroth's father.
When she is 17, two other SOILDERs become First Class, Genesis and Angeal. She becomes friends with them almost instantly, and within a year, Genesis asks her out, to which she accepts. A month before her 21st birthday, Genesis asks her to become his fiance, which she accepts with enthusiasm.
A month after she turns 21, (As time runs faster in Gaia) Sephiroth, Genesis, Angeal, Zack, Cloud, The Turks and Vincent get pulled to Sephiroth's original world by the Goblet Of Fire, because her name was pulled out. She competes, but only under her own name. During the final part of the tournament, she beats Cedric to the cup, keeping him alive, while it takes her to the graveyard. When Peter resurrects Voldemort, she summons Masamune to attack him. When she does, it destroys all of the Horcrux's rendering him mortal, but before she could kill him, he disapparates, escaping. Fifth year, while waiting for Voldemort to show, Dumbledore hires them as defense teachers to keep Sephiroth near him. At the end of the year, Sephiroth kills Voldemort and Dumbledore tries to keep them there, claiming Sephiroth needed to stay, for 'The Greater Good'. Failing that, he tries to kill Sephiroth and Co. but also fails in that endeavor.
What happens after that is your choice
Things you can change:
Lily and James can be alive
She can have a twin/younger/older sibling who is the supposed 'Boy/Girl/Child Who Lived'
You can have people go with them to Midgar