I think the best thing Namco could do with Tira is to do away with Moods entirely, and give her back most of the moves she had in SCIII, along with keepin' a lot of her GS moves [especially some of her JF moves]. That would make the perfect Tira. In SCIV, she was cool, and the mood swings were interestin', but her SCIII iteration is SO much better. I don't know what happen between the transition between the games, but she lost A LOT of her good moves, and stances. Plus, her movements felt stiff and awkward in SCIV...I just want her to go back to her SCIII glory dayz.
If this doesn't happen, I wish she would at least get an easier, more guaranteed way to switch between her moods; less scalin' on her GS combos because if she does a combo that's too long, she'll end up doin' almost as much damage to herself as she does to her opponent; and make her JS less reliant on walls to do combos.