Shop Fierce Costumes' Teen Girl Superhero Costumes. Bring some super-power with you when you go to your next party with Fierce Costumes' Superhero costumes. We've got the sexy Black Widow from the blockbuster hit Iron Man and Halle Berry's powerful character Storm from X-Men. Go with something a little more classic in our Wonder Woman costume. Or if you want something original try our sexy Optimus Prime costume from the movie Transformers! Our Teen Girl costumes are perfect for any teen Halloween, event or photo opportunity. Make it a night to remember with a Fierce Costume.