Dominguez, Ignacio X., Rogelio E. Cardona-Rivera, James K. Vance, and David L. Roberts. “The Mimesis Effect: The Effect of Roles on Player Choice in Interactive Narrative Role-Playing Games.” In 34th Annual Chi Conference on Human Factors in Computing Systems, Chi 2016, 3438–49. San Jose, CA: Assoc Comp Machinery; SIG CHI, 2015. doi:10.1145/2858036.2858141.
eg. if a player is attributed a rogue, or chooses to play a rogue, or has no role attributed and starts to play stealthy, he will keep playing like a rogue until the end of the game. The same for fighter or mage.
In validation phase, the 3 roles were calibrated following D&D 4e TRPG stereotypes (fighter, mage and rogue, either acting strong or magical or stealthy). The subjects of the study (and the validation sample) were mostly young male computer and/or tabletop RPG gamers. Playing one role or another doesn't change the success of the actions.
Play the game here (bugs when loading maps): http://go.ncsu.edu/ixd-demo-rpg