A hunch back from the planet Transillvania
A slightly twisted minded individual, he believes his pretend master, the good Dr doesn't like him, and this boils the hatred he already has for earth.
A LASER GUN
The history of riff raff was never known, only that him, and his darling magenta came to earth in search of new pleasurable delights, and happened upon Dr Frank'n'furter. in an academy mixer where the Good Doctor tore his clothes off and began dancing in drag on the alumni table they took him in, and showed him the delights of the universe. now has the man thinking he's the master of the show.