You are right, I did forget about Macrinus (mixed Geta's timeline). Though I don't agree with your point still standing. Him being an emperor for a short time was more of a fluke rather than an indicator of something common. Rome was in possession of North Africa for 2 centuries or more by than. He is the only Emperor for who you could claim to be indigenous (as far as we know) North African. And he ruled for only 1 year.