Roleplaying Games (RPG) are somewhat similar to cooperative games because players are working together for a common goal, HOWEVER, in RPG's the game is run by a player who is the Game Master or Dungeon Master if playing Dungeons & Dragons. Yes, I said Dungeons & Dragons! It is not the horrible game that the 80's made it out to be. It was written by a Christian, Gary Gygax (I will discuss Gaming and Christianity during our Sunday chit chat).
There are different systems to use when playing a RPG. Dungeons & Dragons is perhaps the most well known. My 13 year old plays Pathfinder. Both of these are fantasy based so they have a definite theme. We have played Savage Worlds several times. Savage Worlds does not have a theme so the GM can create any storyline. It is a time for sometime to become a writer and story teller! One RPG we have enjoyed as a family is when our friend Heath comes over and he is a GM using Savage World rules. He has created several Lego RPG's! We could play for hours using Legos! His story's or campaigns are always fun!
Roleplaying Games are very imaginative! It really is like writing a play and then "directing" the actors! They are also very rules oriented. For someone who likes detail and telling a story RPG's are a great game! My family has both been players and GM's. I have not branched into being a GM but I do love playing with them!