Making a FFVI Boss

[Zemious]

Some of you may or may not know that I make FFVI bosses which are aimed to give players a real challenge.
Some people have been able to beat them and make a video responce to them on YouTube, and some haven't.

I want to make a boss so difficult that he'll be virtually impossible to beat, but NOT over powered.
I've found a way to make a boss have over a million life in Final Fantasy VI so min or max life is not a question.

A few things I'm needing help with is the name and the sprite used.
I want the boss to be extremely evil, in a dark. chaotic sense.

Eviler than any boss Square-Enix has ever made, his goal is to control the Void and use it to destroy not only the planet but the galaxy. He wants to remodel it after his own image, darkness.
This may seem similar to The Cloud of Darkness or Exdeath, although where they failed, he will suceed.

So here are a few names I've been thinking of:
Oxel, Xaroth, Vamine, Exodus, Zeemis, Zambian.

Any suggestions for sprites?
-------------------------
EDIT
I've decided on "Phenomenon" as the bosses name.