Stats

Real Name	Armando Muñoz
Current Alias	Darwin
Alignment	Good
Identity	Secret Identity
Occupation	Taxi driver
Gender	Male
Eyes	Brown
Hair	Black
Unusual Features	Various temporary mutations
Origin	Mutant
Universe	Earth-10005
First appearance	X-Men: First Class (June 2011)
Appearance of Death	X-Men: First Class (June 2011)

Spontaneous adaptive mutation

Muñoz's body possesses the ability to spontaneously adapt to potentially harmful stimuli. He demonstrates the ability to grow gills when submerged and grew a tough armored hide to withstand physical trauma and potent energy discharges.

[information from Marvel Wiki.]

Character traits

Darwin was a mutant with the unique ability of reactive evolution: his body spontaneously evolves to survive in any situation or environment. Darwin shows this ability several times: he has gills grow under water, and his body turns into stone to sustain heavy damage and into iron to be bulletproof.

Darwin was probably the most mature and responsible member of Xavier's and Lensherr's new recruits, and he's quite the heroic type, ready to put himself on the first line to protect his friends.

[information from Marvel-movies Wiki.]

History

Armando Muñoz was a mutant who was able to adapt to any situation. His reactive mutation adjusted his capabilities to his environment. In 1962 he was a taxi driver when he was discovered by Charles Xavier through the use of a Cerebro prototype, and was approached by him and Erik Lehnsherr to become part of a mutant group they were forming for the CIA.

The Hellfire Club tracked the group down and proceeded to kill all of the CIA agents. Sparing the lives of the young mutants, Sebastian Shaw offered them a chance to join him in his planned war on humankind, an offer that only Angel Salvadore accepted. When the others attempt to stop her from leaving with the Hellfire Club, Shaw absorbed Alex Summers' energy blast and killed Muñoz with the energy before leaving.

[information from Marvel Wiki.]