Imagine your generic fantasy world... perhaps less renaissance and more dark ages. in this world, rather than creating a specific character, you create a clan. let's say starting size is a dozen adults, maybe a few kids. you customize their classes and abilities to whatever you want. You also get a Spirit that owns this clan. The spirit is more like what we would normally think of as a PC in MMOs; it has stats and skills and abilities and so forth. under normal conditions, you simply direct the clan as they find a slice of countryside to live on, and then build and develop and grow. Again, think of a smoother-running, much more polished DF here.
You have to either trade for or physically gather everything you want, but that's what the Clan is for. Put those people to work mining and harvesting and building, and watch your settlement grow.
But hey, you want a bit more of a hands-on experience? Your spirit can posess any member of the clan, one at a time, giving you direct control of them. This allows you to do the usual MMO thing of running about hacking and slashing, if you wish. And there are plenty of monsters about in the wilderness, both in nests and evil cities, and in war-bands and migrations that sweep outward to wipe away the settlements.
The members of the clan level up, marry, have kids, grow old and die. the larger and more prosperous the clan is, the better your spirit's stats and abilities get. You can train and deploy entire armies, together with other clans, and lead them from the front with your avatars. But it's not just "hey, let's raid that epic again today"; you need to actually push the gohblins out of the valley and back over the pass, and then you need to set up a fort to keep them there. that leaves the valley to you.
Tell me this doesn't sound like a fun game.