You are correct on that detail - I mixed up Caracalla and Macrinus, the second of which was of Berber origin and also a Roman emperor. Which is an ironic error from part since Macrinus conspired to kill Caracalla. My original point still stands, however, and I believe you are still mistaken in that.
https://en.wikipedia.org/wiki/Macrinus
> Macrinus was born in Caesarea (modern Cherchell, Algeria) in the Roman province of Mauretania Caesariensis to an equestrian family of Berber origins. According to David Potter, his family traced its origins to the Berber tribes of the region and his pierced ear was an indication of his Berber heritage.