(This guy really already had a great design, but just needed some tightening-up)

Mysterious Warrior
MONSTER X

Height: 70 meters
Mass: 25,000 metric tons

Bio:
As Earth descended into chaos during the Kilaak Invasion, Operation: Final War was nearing its climax. Captain Gordon, Dr. Otonashi and the young, inexperienced soldier Ozaki piloted the Gotengo III on the Kilaak Mothership with what little force they had left, Godzilla himself not far behind. There, within the mothership, the Regulator waited, bouncing his knee in excitement...

MONSTER X is perhaps one of the most dangerous daikaiju to ever appear on Earth, largely because it is not merely a kaiju. The Regulator, the Earthling-Xillian hybrid son of Astronaut Glenn and Miss Namikawa, had been waiting for decades of his abnormally long life to carry out his grand drama on Earth. Now, moving towards the last act of his play, he activated a massive genetic-mutating agent in his body, flooding his system with the catalystic energy necessary to mutate himself into a brand new hybrid: Humanoid and GHIDORAN. His skeleton erupted from his body, becoming a bizzare armor, his skin and muscles turned black as death, and his already warped mind pushed beyond the limits of the mortal capacity.
Monster X and Godzilla squared off at Mt. Fuji, while the rest of the monster army watched in awe. The radioactive dinosaur and mutated alien proved to be an even match for one-another, but X hadn't counted on a major factor: that his power was exactly what Ghidorah itself needed to be reborn: after being all but beaten by Godzilla, the space monster's consciousness, which had been fermenting in the Regulator's mind his whole life, finally had enough power to take his revenge. X's body erupted in an almost ceremonious fashion, and Ghidorah was reborn, his body aglow with the power of KAISER GHIDORAH! Now it is up to Godzilla, Rodan, Mothra, Battra, King Caesar, Angurius, Titanosaurus, Zilla, Kumonga, Kamacuras, Gorosaurus and the Gotengo to defeat the King of Terror and the Kilaak Forces once and for all!

Abilities/Aspects:
- Super speed and strength
- Extreme martial arts prowess
- Able to levitate/"fly" for a good distance
- Gravity Bolts from eyes
- Can focus alien chi into attacks

UP NEXT: King Ghidorah