I picked Trader because it is the closest thing. What I want is a diplomacy system with kingdoms, families, republics, and the like. Then pick a kingdom and just be either a knight, a prince, etc and just play the whole thing. The court, the war, the diplomacy, courtly-love, treachery, etc. And economics too (enemy kingdom blocked our trading routes. We lack X, so we need to make a deal with kingdom Y) so there would be some Trader in it.
explorer would be cool too. Turn off "know all history". Then some king might pay you to charter some uncharted territory. Or maybe to go get him some ancient artifact that might or might exist, which is something I've played in my head.
Imagine, Fortress X makes a legendary artifact (a sword, lets say) thousands of years ago. The fortress was attacked but you are told the artifact was still in there. So you have to go and find it. You manage to defeat or avoid all the monsters and bandits and the like. You get to the place but find out that the artifact is NOT there. Defeated, you go to the closest town for a drink. While there, you hear some merchant talk about some sword that he saw over by the port. The description sounds like the sword u are looking for; someone go to the sword before you. You ask the merchant for the name of the port, and you go off. Over at the post, you start asking around and find that the sword was sold and is on its way, via sea, to kingdom XYZ. You make arrangements to get on the next ship to that kingdom, but lo and behold, the next ship isn't for a month! So you have to survive until then. You are broke because it took all your money to get to the abandoned fortress and to pay for the ship (and the merchant in the inn wanted something for the info). To make things worse, a war on the west has made caravans reaching the port scarce, so prices on food are high. You decide that your best bet to surviving is to hunt the wilds and sell the meat. The high prices have increased the number of robberies and crime on the port city, so you offer your help to the local sheriff for some food and coin.
A month passes and the ship comes; and you are off. You might get attacked by pirates, you might get caught in a storm, you might get stuck in some war (sea battle), you might get attacked by some sea monster, possibilities are endless!
OH MY ARMOK! WHY WON'T THIS GAME BE DONE ALREADY!!! I'm wetting myself just thinking about all of this!