In Rocky Horror Picture Show we see Dr. Frank N. Furter in the wedding pictures. Were any other characters whom we see later also at the wedding? Who?
If we broaden the scope from "in the wedding picture" to "in the wedding scene", we have:
The obvious - Frank, Riff-Raff, and Magenta in the photo:
Other Transylvanians in the photo:
Since the other Transylvanians don't have names, I'll use the names of the actors who play them.
Transylvanians (played by Perry Bedden and Henry Woolf) taking the photo:
Other Transylvanians in the scene:
Columbia joins Frank, Riff-Raff, and Magenta in the chapel:
Riff-Raff and Magenta recreate Grant Wood's painting American Gothic in this scene; we see the actual painting later:
Riff-Raff's pitchfork may become the anti-matter laser gun with which he kills Frank, Columbia, and Rocky:
Note: The Sweet Transvestites website was extremely useful for this answer.
When Brad is singing to Janet in the chapel, the people changing it from a wedding to a funeral are Riff Raff, Magenta and Columbia. Always heard a rumor that all the guests to Rocky's "coming out party" were also at the wedding, but I never watched it close enough to say for sure.