With Harry Potter, I do tend to do something during year seven which is usually make Ron the antagonist, which tends to help prolong the war from having a climax so soon if say, Draco and Ron team up or Draco even switches sides too but it does depend on roles and pairs. I am willing to do something with Doctor Who though I must make a disclaimer and say my knowledge lies with the new reboot as I have yet to find time to go back and look at the old Doctors. I'm capable of play 9-12 but I do prefer to do away with River and Clara, as I really do not like their roles. And with Doctor Who, I may be swayed for say a Doctor x OC situation but those can be tricky and most of the time, little thought it taken into consideration though I do enjoy redoing certain episodes with a new spin if a Doctor has a different companion or is doing something from another era, like Nine doing something from Ten's era. I do have plenty of experience under my belt though but the last 3 or so attempted, I've gotten ditched so it is a sore area at the moment but I am willing to give it another go because some of my favorite RPs have had Doctor Who in them.