Personalizing the playing experience is a key factor in making players of computer games feel involved in the virtual world; however, current Massively Multiplayer Online Role Playing Games only to a limited degree allocate development or running resources towards facilitating a personalized experience. In Pen and Paper Role Playing Games, the player-controlled characters form a key component in facilitating the formation of a personalized experience. In these games, characters are often more than the association of stats and skills popular in online games, and several approaches towards utilizing the character-based information directly to personalize the game playing have been developed, e.g. personality systems. Some of these systems can be integrated into online games, providing a realistic and financially feasible method for improving the ability of these games to personalize the experience to the individual players.