Define cosplay heart plainly. Cosplay involves dressing up and pretending to be a specific character from an comic book. It has a huge sensation amongst enthusiasts of nerd subculture around the world. People carefully create outfits and accessories to accurately portray their favorite characters. Costume players often participate in gatherings or cosplay events, where they can display their creativity and connect with others who share the same passion. Ultimately, cosplay is an expression of admiration and dedication for the fictional character and the love for the nerd community.