Dr. Frank-N-Furter
Dr. Frank-N-Furter is the parody of a mad scientist in the movie, more specifically of Dr. Frankenstein. Frank introduces himself as the sweet transsexual of Transylvania. He has everyone in the castle under his influence and control. He is comfortable in his skin and sexuality, and is on a mission to create life out of death.
Janet Weiss
Janet Weiss is the main female protagonist in the movie. She is a normal girl who wishes to marry the love of her life Brad, but at the castle has a moment of awakening of her identity, finding freedom in expressing herself and freeing herself from the norm.
Brad Majors
Brad is the main male protagonist of the movie, he pretends to be brave and charming in front of Janet, but willingly betrays her with Frank, which is his only major contribution to the movie.
Riff Raff
Riff Raff is the creepy butler version of the castle. He is Frank's servant, and Frank goes even as far as physically abusing him. Riff Raff reveals himself to be an alien from the planet Transsexual at the end and kills Frank for failing his mission.
Rocky Horror
Rocky Horror is Frank's creation, his version of a Frankenstein's monster. Rocky is a physically perfect form of a male specimen created for his pleasure. Nevertheless, he isn't devoid of intelligence or emotions, even killing himself after his creator dies.