Genres where there is one clear king

[Dan The Man]

I got to thinking--there are currently a couple of genres/ micro-genres with one dominant series and no meaningful competition. I don't want to turn this into a debate about whether series X is better than series Y; I'm mostly speaking of popularity and genre saturation here. Nintendo definitely owns a few of these niches, but there are others as well. A few examples-

3D Platformers- Mario
MMO's- World of Warcraft
Platform Fighters- Super Smash Bros.
4X Strategy- Civilization

Can you think of any other examples of genres that aren't currently popular or widespread outside of a single game or series?

 

[Demon_Skeith]

Usually final fantasy is RPG.