The M.U.T.O. name is an acronym for "Massive Unidentified Terrestrial Organism."
The M.U.T.O.s were discovered in the Philippines in 1999 after a mining operation drilled into a cave containing two pods containing the M.U.T.O.s, one of which had already hatched. The newly hatched male M.U.T.O, who had hatched after being disturbed by the cave collapsing, burrowed its way to the Janjira nuclear power plant in Japan, where it caused the plant to collapse from underneath, killing several workers, and causing the entire area to be evacuated because of radiation leaking from the plant. This was the work of the recently hatched male M.U.T.O., who was looking for a source of radiation that would be able to grow and sustain it while it entered hibernation. Despite the destruction of the plant, the M.U.T.O. linked itself to the radiation hot spot and entered a cocoon-like state, absorbing all the radiation from the surrounding area. The second pod containing the female M.U.T.O was taken by the Americans to the Yucca Mountain Nuclear Waste Depository in Nevada.
30 years later, the male M.U.T.O. finally emerges from its cocoon and lets out a mating cry for its female counterpart. It lays waste to the power plant once again before sprouting its wings and taking off. It later appears in Hawaii, only to be met by every single U.S force imaginable. After using numerous futile missiles, tanks, guns and more, they evacuated the surviving in citizens in Hawaii and dropped a nuke, managing to kill the creature, and luckily, its near by mate. But the radiation left from the nuke had somehow mixed with a small amount of radiation that came from the creature before it was destroyed. As this seemingly dangerous radiance spread throughout the world, it was rendered harmless. Until humans started mutating that is. They began to transform into MUTO themselves, and ended up rampaging around the planet for a few years. But some were able to somehow control their transformations and change back and forth willingly, but for a limited time. Some of those you could keep control of themselves even went as far as becoming a part of the military, being named the M.U.T.O Cross Guards. But others used their abilities to rampage around the world, and turn the world into the Age of Tyrants. Humans have also created their own technology to combat the creatures. Giant Robots basically.
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Ok so most of these M.U.T.O are roughly 30 to 86 meters tall, some even taller. Yes, some do have unique abilities.

Rules:
No Godmodding, and yes, that is different from stretching a fight.
None of that elemental bullshit. Blowing fire or electricity is acceptable.
No killing a person's characters without permission.
Transformations can last from 5 to 15 minutes. Or 15-30 minutes, depending on the size.

Human Character Sheet:

Name:
Age:
Gender:
Appearance:
Personality:
Bio (Optional):
Extra

M.U.T.O Human Character Sheet:

Name:
Age:
Gender:
Appearance:
M.U.T.O Appearance:
M.U.T.O Height:
Ability(s):
Transformation Duration (Time Limit):
Good or Evil?:
Bio (Optional)
Extra: