Wasp

Wasp is a member of the Avengers and an ally of Ant-Man who is one of the playable characters in LEGO Marvel Superheroes, LEGO Marvel's Avengers and LEGO Marvel Super Heroes 2.

Background
Janet van Dyne was the daughter of a wealthy scientist named Vernon van Dyne. During an experiment, however, an alien monster was unleashed and Dr. van Dyne was killed. Her father's associate, Dr. Henry "Hank" Pym, had created a substance called "Pym Particles", which allowed the user to grow or shrink in size, and had become the superhero Ant-Man; when Janet's father died, she convinced Pym to help her, and he gave her a supply of "Pym Particles" and subjected her to a procedure which granted her the ability to, upon shrinking, grow wings and fire blasts of energy, which she called "wasp's stings".

LEGO Marvel Super Heroes
Wasp does not have a major role in the story but is thought to have aided the heroes in their mission to prevent Doctor Doom from creating a weapon of mass destruction.

LEGO Marvel's Avengers
Wasp does not have a major role in the main storymode of LEGO Marvel's Avengers.

LEGO Marvel Super Heroes 2
She helps The Avengers in the battle against Kang.

Abillities

 * Wasp can use basic melee attacks such as punches and kicks.
 * Wasp can shoot ranged attacks.
 * Wasp can shrink when flying.

LEGO Marvel's Avengers

 * Wasp (MCU/Janet Van Dyne)

LEGO Marvel Super Heroes
Wasp can be unlocked by completing an ant maze using Ant-Man on top of a building in the free roam.

LEGO Marvel's Avengers
Wasp can be unlocked by finding her token in the level Ultron Undone.

LEGO Marvel Super Heroes 2
She is unlocked in the  "Avenger's Wourld Tour"  level right at the beginning.

Trivia

 * Wasp unlike Ant-Man can only shrink when flying and not when standing still.