Love in rgps may be all well and good, but I'd like to see a reverse story instead of the usual 'Hero vanquishes evil etc etc'

I'm not sure if it's been tackled (I cant recall this) but I'd like to see something like
'lowly servant of a kingdon wants to rule said kingdom (or world)' and you plot to acheive this. But through a decent rpg with quests and npcs, deceiving people, murder of the right people etc...

Combat would require a lot of thought though...it's easy to be good and chuck loads of monsters at the player...but vice versa it'd have to be different...