Oh, I forgot to add a very good boss design.
The Cloud of Darkness DS-form plainly rocks.
Very good 3D + Very nice animations + Nice Surge Cannon, yeah, an excellent looking Final Boss.
Only BAD thing about that bossy is a) Her music, not really epic and b) Her death-animation. She dies like a NORMAL boss?! WTF? It's the Final Boss! Even in the original NES-verison they had her sink away! And in DS she doesn't! There's even a victory fanfare! In which Final Fantasy had Final Bosses a plain normal, boring death animation and a victory fanfare?! They made everythign so close to the original and now this?!
Besides those freaking bad points, good looking boss. This topic is about their design, anyway.
Beware, though, spoilers!
Don't come complaining if I spoiled it for you:
http://www.youtube.com/watch?v=osB-cd-6ytU&NR
Jenova, I know FF7 graphicas weren't that good but when you see jenova in Shinra inc. is the capsule it's freaky.
I like FF 7 boss. really cool. FF7 is the great game of of Final Fantasy serious.
Super old thread but here's my contribution!