More dumb D&D character concepts:

• A self-proclaimed “greatest swordsman in the world” who’s legitimately unstoppable in a one-on-one duel, but messily goes to pieces in literally any other scenario because their training didn’t cover that. The party’s basic battle strategy consists of pointing them at the highest-threat target and going to extraordinary lengths to ensure nothing “distracts” them.
  
  
• A wizard with a wildly eclectic yet strangely limited selection of spells who dismisses any shortcoming in their repertoire by claiming that it falls outside their specialty. If anyone tries to pin them down on what their specialty actually is, they remark that there’s no word for it in your barbarous tongue, then refuse to elaborate.
  
  
• A cleric who’s embroiled in a constant ethical debate with their own god, voicing their arguments out loud and receiving replies which evidently only they can hear. The topics discussed range widely, though they always seem to segue to whatever the party is currently up to just in time for the cleric to prove a point by casting a situationally appropriate spell.
  
  
•  An extremely Lawful rogue who’s perfectly okay with cheating, stealing and murdering, but only under the terms of an elaborate code of conduct they’re able to cite chapter and verse at the slightest provocation. These are allegedly the bylaws of the prestigious thieves’ guild to which they belong, but no-one the party encounters has ever heard of it.