This reminds me of the movie Seven. Great movie. But, anywayz here's what I think:


Wrath- Sephiroth
His anger led him to burn down a whole town and led a destructive path of violence. He grew to hate mankind so much so that he wanted to believe he was the very essence of Jenova. He wanted to be different, so he wouldn't have to hate himself.

Lust- Irvine
He loves "naughty magazines" and constantly flirts with pretty much every girl in sight.

Envy-
The Unsent fiends
I agree with your description above.

Greed-
Yuffie
Always stealing materia. -_-

Pride-
Tidus
He's very arrogant and feels he's better than his father. He doesn't like to be compared to him for that reason, or atleast one reason why.

Sloth-
Vivi
He's not really lazy, but he's pretty slow.

Gluttony-
Quina
It eats...alot.