This takes an interesting look at what would happen if Harry was Sephiroth reborn. Unlike others, this one is not a well adjusted individual, but a Shell-Shocked Veteran who has been both hero and villain, savior and monster, and who is a hairsbreadth from reenacting Nibelheim at Hogwarts. It goes into detail on how broken Sephiroth is inside and how his friends are the only thing keeping him from becoming the monster he was once again.
FanficRecs Interesting, to say the least
This takes an interesting look at what would happen if Harry was Sephiroth reborn. Unlike others, this one is not a well adjusted individual, but a Shell-Shocked Veteran who has been both hero and villain, savior and monster, and who is a hairsbreadth from reenacting Nibelheim at Hogwarts. It goes into detail on how broken Sephiroth is inside and how his friends are the only thing keeping him from becoming the monster he was once again.