I beg to differ. Reason being, Yunalesca was a master of negative status alignments; something this game REALLY lacks in. I mean, incorporating more status effects in this game is a grand idea. With that being said, Yunalesca was boss bitch when it came to kicking ass with Zombie and Death. And as a twist, they should give her the ability to heal the opponent to take small bravery damage doing Zombie. She can also use this fighting style to heal when she's a support. And Yunalesca > Cloud Of Darkness...lol
Edit: And I'm with antagonist when it comes to Dissidia being more like other fighting games. I would erode originality
Edit2: Oh, and btw, think about the great story having Tidus, Ject, Auron, and Yunalesca in one game. Ject was a warrior of light before right? It gives him a bigger incentive to be so if Yunalesca is a warrior of chaos...^_^