you may not want easiest to optimize for. you may want to go with best and then work hard to get it. the versions you do not optimize for you can throw in the keywords tags or on other pages.
you also may do better to focus on a more specific role playing game that you really like as there is probably a decent amount of competition by the vampires in that arena, and as we all know, vampires are evil
then again, google does not like evil stuff, so vampires might not be very competitive
