Define cosplay heart plainly. Cosplay is all about dressing up and pretending to be a particular character from an video game. It has immensely popular among enthusiasts of nerd subculture around the world. People thoroughly design costumes and accessories to accurately portray their favorite characters. Costume players usually attend conventions or cosplay events, where they can exhibit their artistry and meet others who share the same passion. In the end, costume play is an manifestation of appreciation and dedication for a fictional character and a love for the nerd community.