OK one more post:

I thought this video of Sorceress Edea was a geat example of what I expect from Shiva.
http://www.youtube.com/watch?v=NADJo6wOcmA

She's one of the most intimidating women in all of FF, able to destroy you with a dismissive wave of her hand (assuming you aren't a SeeD). She even uses ice magic shortly after this scene, but that's part of a bigger spoiler :3.

I wonder how much of Shiva's new design is inspired by characters like Edea.