My list of annoying clichés?
-Characters with names drawn from household cleaning products and trendy corporations (Calgon the Wizard, Nipro the rogue, Dilmar the Warrior)
-Adventurers who only exist to adventure. How many people only live a mercenary lifestyle in historical experience? A very rare few, comparatively. I'd like to see more characters with missions of vengance, goals of starting businesses, or just pay out a massive family debt, or something besides being an orphan and living for treasure seeking. It's a "grade-b" version of the old series Kung Fu.
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I did the naming after household things when I was a kid first learning D&D, but would never do that now. I didn't realize it was that common, but we did have a newcomer to the group several years ago (since 86'd) that was dying to play a kender paladin thief based on the Batman. When the DM nixed that idea (a real hard ass, no?), he played a straight human paladin with the last name Bwayne (as in B Wayne)
And, when the Byzantines were at war with the Turks/Ottomans, they often used mercenaries to fight for them (sometimes, the mercenaries were even Turks). And, you could technically say that the current US military is mercenary, as people have to volunteer to fight for the military for a salary and/or education. If nobody signed up, they'd either have to recruit harder, raise salaries, or re-institute the draft.