most powerful FF villain.

[The Crystal]

Yes it is all about opinion. Thats the point of a forum. You dont need to tell us that.

Is allways good to say it. Because in every forum, allways exist someone that think that his/her opinion is the absolute truth, and everyone that desagree is wrong.

But I'd say the most evil is Ultimecia.
I chose Ultimecia as the most evil because she was willing to allow Rinoa to die in order to release Sorceress Adel and achieve Time Compression in order to destory the SeeDs and become a God.

I know that this is off topic, but you forgot to say that Ultimecia(inside Edea's body) used Galbadia army to kill many people, launch missiles against the Gardens, and made the two Gardens fight against each other.

And in my opinion, Ultimecia is the most powerfull because she can absorb everything(including the other villains).