Mystique (Marvel)

Little was known about Mystique's past due to the fact that she could eliminate the outward signs

of aging with her shapeshifing; it was not known exactly how old she was. She apparently learned to use her powers at a very early age which made her family fear her, for there is no evidence known to the public or the government that Raven Darkholme ever looked like anything but a normal human being.

According to Mystique herself her powers manifested when she was twelve years old and she had to fight just to survive.

Metamorph: Can psionically alter the formation of her biological cells at will. As a result she can cause herself to look and sound like an exact duplicate of any human, humanoid, or semi-humanoid being of either sex, wearing virtually any kind of clothing. Her control is so exact that she can precisely duplicate another persons retina pattern in her own eyes, finger, palm and skin-pore patterns on her own hands and skin, and vocal cords to match voices to the point of corresponding voice prints. While she can make herself look exactly like a person who is physically bigger than herself, she will not weigh as much as the real person does.[34]  Although she can maintain the form of a person of her height, weight, and build indefinitely, the longer that she maintains the form of a person physically bigger than herself, the greater the strain she feels.

Mystique was once exposed to dangerous levels of radiation in order to save the life of Toad. The process morphed Mystique's appearance to match her more reptilian physique from the movies, and boosted her powers so that she could now morph her body into taking certain desired physical traits depending on her situation at the time (note: this reptilian form was quickly discarded, whether it was because of retcon or if she simply shape-shifted back to her previous form remains to be seen).

Examples of this new ability included: night vision, wings on her back, talons in her fingers, sharp fanged teeth, natural body armor, mermaid-like tail, and she could even compress nearly two-dimensional like a rolling pin to glide on air currents, similar to Mr. Fantastic, which she used to survive an explosion.

Since her resurrection by The Hand, her powers have been enhanced to a higher level than they were before, to the degree that she could fool super-humanly acute senses such as Wolverine's sense of smell, something she couldn't do before her death.