During his sixth year Harry was told that Tom Riddle hadn't been alone when he had entered Hogwarts: he had been accompanied by his (not biological) twin. A twin who had been killed sometime during their Hogwarts career. The story had consequences no one had foreseen. Timetravel/paradox. NOT twin!Harry.
EnniNova:
Не обижайте друзей, не говорите того, о чем можете пожалеть, не слушайте тех, кто смеется над вашей дружбой. Они чужие, а друг свой, родной. И не важно, сколько ему лет и есть ли у него косички. Если это друг, то берегите его как зеницу ока.