Sometimes in Sim games there are all sorts of characters, in which I mean really all sorts of characters, for example: If you play the Sims Medival then, there are certain characters, like, queens and kings and you can make them make other people work in all sorts of medival jobs.
Another example: if you make a vampire then maybe there could be an option whenever you click on someone saying 'Bite' and when you click it the other character turns into a vampire!
Another thing to be careful about is: Firstly, you have to ask the other character if they do want to be a vampire because you never know what kind of harm it might cause them.
Hope you like my idea!