Emma Rose Potter is the twin sister of Harry James Potter, But he doesn't know it. That night when Sirius came Hagrid didn't let him take Harry but no one knew about Emma, that is except for her parents and Sirius, so when Hagrid wasn't looking, Sirius took Emma but didn't raise her himself, he gave the baby to Severus Snape, Emma looked exactly like Lily except for one detail, Her eyes, her eyes were hazel, like her father's and Sirius deceided to show peace he gave Emma to his former enemy, and asked him not to tell dumbledore, Well that worked, Emma was kept a secret, until one day when Emma received a letter inviting her to 'Bow baton academy of magic' Snape with tears in his eyes let her go. When she was seventeen Emma finally met her brother Harry...
COMPLETED
*takes place during hoo*
Medea Jackson was dead. At the age of 12 the younger Jackson twin was brutally murdered by what Percy now knows was a Cyclops. That's what Percy believed, that's what Sally believed, but Poseidon knew better.
She was in fact alive, but horribly injured from her interrogation. The monsters wanted to know where Zeus's master bolt was and wouldn't stop until they got it from her.
A boy her age named Jason Grace saved her, taking her to a safe place called Camp Jupiter. There she and Jason became best friends, siblings, until one day she disappeared. Then a month later, Jason did too.