I mean, you say 'Courage' but uh, I'm gonna be honest on this one? D&D since day 1 has always been a high fantasy thing that's about as far from low fantasy as you can get. The fact the base game comes with three fantastical races and two magic users right off the bat is pretty much indicating its supposed stuff, and low magic ain't it.
People have mangled it into a low magic toolkit, but I very specifically use mangled there because, it ain't designed for it from day 1
Arthur fights plenty of monsters, just depends on which exact retelling you read, and Odysseus is infamous for having to deal with monsters (albeit tricking them as he is the archetypal rogue)
Secondary character from Dragonball and Dragonball Z. Regular human and therefore completely overpowered by the majority of characters in the later stuff. His main thing is destructo disks. Married an android, short.