Real Name: Piotr 'Peter' Rasputin
Height: 6'6" [Normal] | 7'5" [Armored]
Weight: 250 lbs [Normal] | 500 lbs [Armored]
Hair: Black [Both Forms]
Eyes: Blue [Normal] | Silvered [Armored]

Appearance:
In his normal, human form, Piotr is a tall, well-built young man in his mid twenties with an easy-going smile and sensitive, rich blue eyes.  He tends to dress in a more casual manner, preferring t-shirts, flannel shirts, jeans, and boots.

While in his armored form, Piotr gains nearly a foot in height and twice the mass of his human form.  His body takes on a metallic, silvery-steel sheen of banded metal, his short, well-kept black hair becomes stiff and rigid, locking in place, and his eyes lose their deep, soulful blue and become hardened steel.

Personality:
An artist and bit of a pacifist at heart, Piotr would often prefer to talk his way out of an issue rather than fight.  His soft and quiet voice often takes people by surprise - those who see the massive, natural, muscular build expecting him to be loud and violent.  Still, Piotr loves to laugh and, in those moments, that deep belly laugh of his can fill a room.

Piotr is also over protective of those he cares about, those he loves.  Of course this includes his siblings, but also extends to the extended family of the X-Men.

Yes, the young Rasputin might be a gentle giant, but harm innocents or those he loves?

That is when the Colossus comes out.

Powers

• Enhanced Mutant Physiology: Colossus is a mutant with the superhuman ability to convert the tissue of his entire body into an organic steel-like substance.  This substance resembling steel is of unknown composition but appears to be analogous to osmium and to carbon steel.  He is able to transform into this armor-like state at will (the process is virtually instantaneous) and remain in that form for an as yet undetermined amount of time.  The longest time he has remained in armored form by choice so far has been five days). Once in his armored form he remains so until he consciously wills himself back to normal.  If he is rendered unconscious, however, he spontaneously reverts to his normal form.
  
• Organic Steel Form: While in the armored state, Colossus possesses the same degree of mobility that he does in his normal form, though his endurance and speed are enhanced.  The conversion from flesh and bone to organic steel is accomplished by a psionic whole-brain interface with an ionic form of osmium, an extremely dense metal, located in another dimension. In willing the act of transformation, Colossus actually exchanges osmium atoms for his carbon atoms. The psionic interface with the other dimension re-creates all of Colossus's body in functionally similar organic ionic-osmium materials. The process by which Colossus gains additional mass from an unknown, perhaps extra-dimensional, force remains unknown. Colossus cannot become partially or selectively armored; his body is either entirely converted or not.
  
• Superhuman Strength: After transforming into his armored state, Colossus possesses vast superhuman strength.  As a teenager, he was sufficiently strong enough to be listed as a class 70. (This scale is only for comparisons between characters, and should not remotely be taken literally). However, as a fully mature adult, his strength has increased to the point that he is listed at exactly class 100.  He was able to hold his own against the Juggernaut, though he usually lacks the raw power to defeat him, such as when he was easily overpowered and knocked out.
  
• Superhuman Stamina: Also, while in armored form, Colossus' musculature produces considerably less fatigue toxins than the musculature of a normal human. At his peak, he can physically exert himself at peak capacity for several days before the build up of fatigue toxins in his blood begins to impair him.  He also does not need to breathe while transformed, but it is believed that he could not survive for long in a vacuum.
  
• Superhuman Durability: In his armored form, Colossus has a high degree of imperviousness to injury.  His armored form can withstand ballistic penetration, including that of a 110 millimeter Howitzer shell.  He can survive temperature extremes from 70 degrees Fahrenheit above absolute zero (-390 degrees Fahrenheit) to approximately 9000 degrees Fahrenheit.[9] He can survive a collision with a loaded, one ton flatbed truck at 100 miles per hour or an explosion of 450 pounds of TNT.  He can also survive falls from great heights while in his armored body.  Colossus' armored form cannot rust under normal Earth conditions.  Furthermore, his eyes become steel-like and allowing his eyeballs to withstand and deflect even the impact of a .45 caliber bullet.
  
• Peak Human Speed: In his armored form, Colossus's speed is at the peak of human potential, enabling him to run 32-36 mph.

Abilities

• Skilled Painter: Peter is a talented artist adept in both sketching and painting, once becoming very famous using the name Peter Nicholas while suffering from amnesia.
  
• Expert Combatant: Despite his peaceful nature, Piotr is a skilled combatant, excelling in boxing, wrestling, and Judo.  He has honed his reflexes and combat abilities, learning to utilize the unique nature of his powers in countless Danger Room sessions and against expert fighters such as Wolverine.
  
• Linguistics: A native Russian speaker, Piotr also speaks fluent, if accented, English.  He is also fluent in Japanese.

Weaknesses

• Vibranium: Colossus's metal form vulnerable to the anti-metal vibranium - the unique properties of which interfere with the molecular structure of his heightened, augmented form.  When being stabbed in the arm by a vibranium example, For example, he was shunted back to his normal form.
  
• Adamantium: The organic metal form of his augmented body offers no enhanced protection to adamantium or items bonded to the metal.