Favorite Boss Design

[The Crystal]

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.

A link, please?

Beware, though, spoilers!
Don't come complaining if I spoiled it for you:

http://www.youtube.com/watch?v=osB-cd-6ytU&NR

Thankyou very much!

Yeah, her design is very cool.