someone who dresses up as a character from a film, TV programme, comic book, etc. as a hobby

Hundreds of cosplayers in elaborate costumes attended the event. 数百名身着精美服装的角色扮演者参加了此次活动。

A cosplayer dressed as the Silver Surfer posed for a photograph. 扮演银色冲浪者的角色扮演者摆出姿势摄影留念。