For one thing, both Sephiroth and Kujah were misunderstood souls. And both of them thought they were rejects! Well, Sephiroth was the ultimate form of the Mako-infused SOLDIER and he was confused as to why he was SO different from others....even as a child, he always knew he was different. But his idea of his own uniqueness shattered when he found out he was just a test subject. And HOJO DID THAT TO HIS OWN SON~~~~!!! ~o^****
Kujah was a Genome that was supposedly perfect except for one thing...he wasn't immortal, and he suddenly had a mind of his own to break away from his creator Garland. He didn't want to become an unwilling puppet with no soul in his creator's hands, that was why he took it to himself and destroyed them all. He created the Black Mage army. And then, Zidane appears and makes Kujah even more uncertain of his existence. What's a guy to do in those CIRCUMSTANCES?!
Seifer was just totally disturbed. He's used to bending people to his own will, and he has those Garden Disciplinary Committee members to back him up in whatever stupid thing he did. Makes me want to kick his face with my boot. Yup, he definitely makes up for the "snobby rich kid with a problematic attitude" recipe.
Oh, and Seifer's Gunblade looks like a sort of a rapier. The way he holds it, he's some sort of fencer. I guess he really is one rich kid.
Life is short.
Let's all grab a BEER~~~!!!