I have totally met the best people I have ever met in my entire life through cosplay and anime conventions though. A Marvelous Halloween Begins with the Best Marvel Superhero Costumes for Kids and Adults. From the overly righteous Captain America to evil villains like Thanos, guardians of the galaxy costumes create your own Marvel story by checking out our wide assortment of Marvel superhero costumes and accessories or visit: Halloween Costume For Kids.