The thing I find the most intriguing is that, in reality it didn't matter who Sephiroth was, he was not a descendent of the Ancients, and he wasn't really a descendent of whatever Jenova is - he was just another person, who's mother happened to be injected with Jenova cells, and was then infused into the Life Stream - it could have all been avoided, if the Jenova Experiment had never took place.
true that. Most of what we got about Sephiroth right up till disc 3 was just a concept inside Clouds mind, some kind of superhero he looked up to. Pretty much in the same way most fanboys view Sephiroth as some omgawesome villain.
This twenty-year-old boy was distinguished from childhood by strange qualities, a dreamer and an eccentric. A girl fell in love with him, and he went and sold her to a brothel...