Yeah as far as role I think Lincoln and FDR are the most obvious parallels. Very popular presidents that also took in a lot of executive powers during a big war. With Lincoln it’s even more direct due to the war being a civil war about the secession of a Confederacy and the army being called the Grand Army of the Republic. If you count Julius Caesar and Napoleon, they are part of it too.

You’re probably talking more about personality though. For personality I think it would have to be a Roman politician, though I’m not familiar enough with them to pick one. He has the aristocratic bearing, the ambition, and the fatherly sense of concern for the Republic as an institution.