Three Kingdoms

If you go to Dynasty Tactics 2, then the second one is definitely Xiahou Dun.  In that game, when Dun and Sima Yi rebelled against Cao rule, their faction took the color of purple.  Perhaps this was included to show the division within the Cao camp that ended the period of war.

So, left to right, I see Sun Ce, Xiahou Dun, Liu Bei, and the guy pompous enough to be the only one wearing a cape...  Cao Cao.