Vague is a fictional mutant

Mutant (Marvel Comics)

In comic books published by Marvel Comics, a mutant is an organism who possesses a genetic trait called an X-gene that allows the mutant to naturally develop superhuman powers and abilities...

 character in the Marvel Comics

Marvel Comics

Marvel Worldwide, Inc., commonly referred to as Marvel Comics and formerly Marvel Publishing, Inc. and Marvel Comics Group, is an American company that publishes comic books and related media...

 Universe.

Powers

Vague is a mutant that had the ability to become transparent or invisible. She fought against the X-Factor team in an attempt to get at a former teammate they were defending. It did not go well, particularly because X-Factor had Wolfsbane

Wolfsbane (comics)

Wolfsbane is a Marvel Comics superheroine, associated with the X-Men.A Scottish mutant, Wolfsbane possesses the ability to transform into a wolf or into a transitional state somewhere between human and wolf...

, who has canine-level senses, allowing her to easily detect Vague.

She is currently depowered due to events of M-Day.