I agree with JRPG = XNF. Though aren't videogames more an Introvert activity? Not sure about J/P.
Not sure what type of CRPG your talking about.
Playing RPGs is more of an introverted activity to be sure, but if we are to classify the games themselves (for some bizarre reason), they do involve traveling within the confines of a group (though the main protagonist is often an introvert, unwillingly forced into proceeding on the journey). As for J, I chose that given the rigid linearity of the JRPG format.
By "CRPG," I refer to games in the vein of Baldur's Gate and Planescape: Torment.