Forbidden banished exiles. Especially in MMORPGs, I've found that the most common overall in-setting guild theme is "we don't belong in the society that this setting established." It's not just in MMORPGs, of course. It's often a crutch (or training wheels, if I'm being generous) for some roleplayers to participate by not participating. I'm not saying that a character (or a player for that matter) has to bend the knee to Lord So-And-So, but it's kind of hard to find plot excuses for the the forbidden banished exile to even be in the same picture, let alone get the quest to do the thing.
Plot armor dependents. Yes, it's quite likely that if I'm running the game and telling the story that I won't have the guards kill a player character on sight even if they do something exceptionally stupid just to see what happens, like stabbing a random citizen. Those kind of players don't tend to last long if their only contribution is "try to knock down the props just to see what happens on set."
People that directly lift an established character in well known fiction, often just changing the spelling, and often not even trying to resemble or act like that character. In an older MUD, I recall a "Frrodoh Bhaginz" that was a Half-Ogre hunter. Again, it didn't ruin the game, but it was annoying. I admit it can sometimes be a red flag warning, and a helpful one, if the lifted name is from chud fiction, like if they have "Rahl" in their name. It can show me what to expect, either in a tabletop group or in a MMORPG guild.
Prison break out scenarios. This is, I admit, completely a preference thing but I just hate them in videogames and ttrpgs. I think it's the sudden reduction of choices and the fact all my character's cool stuff gets taken away.
My latest DM ran one, and I can totally appreciate that he ran it really well. There was a solid reason why we were there, there were clear things we could do to escape, there were interesting NPC's to interact with and ally with and it is about as much fun as I have had with this kind of scenario - especially the end where we instigated a full blown prisoner takeover but I still found it ridiculously frustrating but like I said, totally a matter of personal preference.
I've done a fun twist on those: prison break-ins.
That does sound fun! Funnily enough, we did something similarish a few sessions later which was cool. I think the DM realised that the party consisting of my ranger character, a rogue and a dexterity based fighter were very much up for sneaking about.