Septimius Severus is going to trigger the libs for sure, because they keep running the narrative that he was "DA FIRST AFRICAN EMPEROR. DAS RITE, WE WUZ EMPERORS AND SHIET!"
Also, he would have thought of himself as a Roman, not as African as 'murican blacks insist on injecting.
Same with Macrinus. They were both born in North Africa but at that time, it was just another Roman province. Back then, color and prejudice weren't linked -- unlike racism and idpol today.
Rome was unique in the ancient world for its inclusive citizenship. In the past, a city-state like Sparta might have conquered a people and enslaved or slaughtered them all. Rome, on the other hand, blew ancient people's minds by assimilating or even naturalizing the conquered. The ancient Romans didn't even force conquered peoples to give up their own languages or customs. So the Romans having at least 2 emperors hailing from the African provinces, wasn't all that unusual.
Whether they were good or bad emperors, that's another topic entirely.
Edit: a bit more info on Septimius.