This would depend more on which person you would be asking. If someone doesn't listen to pop/R&B music, they wouldn't know who Rihanna is, but if they don't watch or read comic books/movies, they wouldn't know who Wolverine is. If you're referring to Hugh Jackman, the previous still applies. In my opinion, it's a bit of a draw on this one. Rihanna is world famous, but Wolverine has been famous for generations. It's a bit like asking if Taylor Swift or Iron Man is more famous.
Rihanna is more famous
sonic the hegdhog is bar far more famous than wolverine and is better too
Rihanna
rihanna
rihanna
adele
rihanna
rihanna
Rihanna is more famous than Postman Pat by far.
Cleopatra used to be more famous, but these days Rihanna is more famous, at least with a lot of dumb bozos.
rihanna
Sadly, Rihanna.