[Ninjavenom]

Sephiroth was planning to destroy the world, and make himself god. The only difference between him and other villains is that he nearly succeeded. Plus he looks cool. If you'll notice, also, it wasn't really him who was the mastermind behind the plans, it was Jenova. That's why Jenova's arms move during the Bizarro Sephiroth fight. I had a whole Thesis paper someone wrote on the story and symbolism of the game that mentions it. It might not be true, but it comes closert to explaining everything than anything else i've read. I'll look for it today and see what i can turn up.