Well, the one concept that's really never been done in D&D is the non-magical class whose primary focus is the Interaction pillar. The "Talker" or "Face" class. The other two pillars have classes mainly focused on them-- the Combat pillar has Fighter, Barbarian, Monk etc... and the Exploration pillar has the Rogue, Ranger etc... but the Interaction pillar? The classes who have dabbled in that have always been magical in nature-- the Bard, the Paladin. The closest they've gotten non-magically is the Rogue assuming you build it specifically in that way, away from the prototypical thievery-esque Exploration mechanics.