I think there might be a couple Vulcan background characters with forehead ridges. My guess is that a significant portion of the early Vulcans that rejected Surak’s teachings were from a particular ethnicity, and the group that left the planet and rebranded as Romulans included most of that ethnicity.
Vulcans and Romulans are closer than you’d think. I’d say they’re only separated by a pair of shoulder pads
And some forehead ridges, sometimes. Early phenotypical signs of genetic divergence?
I think there might be a couple Vulcan background characters with forehead ridges. My guess is that a significant portion of the early Vulcans that rejected Surak’s teachings were from a particular ethnicity, and the group that left the planet and rebranded as Romulans included most of that ethnicity.