Dungeons & Dragons is commonly described, and understood, as a heroic TTRPG, especially in the 5th edition, but I would say since AD&D 2nd Edition at least. The assumption is that you will grow from humble beginnings to epic capability. The assumption is that you will be heroic – brave and fighting for the betterment of the world, or at least the betterment of your character’s part of it. You are fighting evil, saving the innocent, etc.
But then you get murder-hobos. We’ve all seen players turn into murder-hobos, just wandering around, killing whenever they want and fleeing whatever consequences might arise. The DM tries to motivate them to buy into the world-saving story they had hoped to tell, and they squirm away, choosing violence and shenanigans instead.
People associate D&D with heroic stories like The Lord of the Rings, but heroic literature was not the original inspiration for D&D. The original inspiration was what I think of as scoundrel literature. I realized this when I recently took time to read through multiple Dying Earth novels by Jack Vance. D&D’s spellcasting system is “Vancian”, meaning it is inspired by the magic system of the Dying Earth novels, and Vecna, one of the great villains of D&D from the very beginning, is an anagram for Vance. If you’ve ever read Vance’s Dying Earth stories, you’ll know what I mean by scoundrel literature. His characters are selfish, arbitrary, clever enough to get into and out of trouble, but they almost never learn, and they are anything but heroic. Reading stories of Cugel’s Saga, it was effortless to imagine him as a D&D character simply doing the things that the game rewards – trying to cash in through violence and shenanigans.
Over time, D&D has moved away from scoundrel literature and more toward the heroic with each successive edition. It would be hard to imagine Cugel or Liane the Wayfarer as characters in 3rd, 4th or 5th Edition, but I feel like they would fit in perfectly in the verisons of D&D that the OSR seeks to replicate and reimagine. At the same time, the Dying Earth novels have a wealth of material and inspiration for precisely these kinds of scoundrel stories.