Given the preponderance of blonde emperors, it would be reasonable to assume emperors in general were rather light-skinned.
Sadly this _is_ an area which is indeed full of bias.
The color of Augustus here[0] is definitely blonde for me, bordering on platinum, while what I meant is that it might as well have been darker, i.e. [1] which I would call "light chestnut".
[0] https://voshart.com/ROMAN-EMPEROR-PROJECT [1] https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...