Hawkeye (Clint Barton) - He doesn't have a power, but he does have a bow and arrow, and he is called Hawkeye for a reason. He can shoot anything at any distance. Pretty cool huh.
Weaknesses: Close combat, Running out of arrows.

Black Widow (Natasha Romanova) - She is the only female avenger. She isn't usually a "warrior" and her usual job is being a spy. She is an awesome fighter and can handle pistolets pretty well.
Weaknesses: Not much power, only relies on her agility and guns.

Iron Man (Tony Stark) - He is cool. He has a sense of humour and he is a genius when it comes to technology. When he is in his suit he can fly with jet powered feet and shoots blue powerful energy from his hands.
Weaknesses: His suit shuts down at cool temperatures, his suit can run out of power when damaged too much.

Hulk (Bruce Banner) - Hulk isn't his regular form, he is usual just a human. When Bruce (Hulk) gets too angry he turns into the Hulk and doesn't really know good and bad and just destroys everything.
Weaknesses: Being Hulk (out of control)

Thor (Thor) - Thor is a god from another universe. He relies on his hammer which can conduct electricity, nobody can lift the hammer but himself (Not even Hulk)
Weaknesses: Not much really.

Captain America (Steve Rogers) - He is the leader of the Avengers, he justhas a shield which is both a weapon (a frisbee) and a shield (Duh).
Weaknesses: Not having the shield.