Problem: Players will sometimes build a character that is overloaded with expectations from the concept or background. The character is essentially built with "plot armor" in the background story, or is given anecdotal supreme expertise in some field or activity that makes their starting character stats a lie.
Example: I recently had a player build a character who was a royal princess on her home planet but who left that behind to become a smuggler and then a slicer and then a spy. The character had a financial empire that she had walked away from (but that the player said was still out there), as well as a vast spy network and information brokerage that would put the Bothans to shame. The character also had a list of 25+ contacts who could be called upon to perform various services and functions. The player built in associations with most of the known crime organizations, and had apparently had been neutral, then joined the Empire, and then joined the Rebellion but didn't really consider herself a part of the Rebellion and the player told me "The Rebellion doesn't really trust my character." The character also could build any modification or technical device, and had planted data collection devices like Johnny Appleseed. There was a sister of the character that was the only person who knew where the character had gone but was basically holding the assets of the corporation and smuggling operations for the character. The character was equal parts celebrity and secret person as they had numerous fake identities.
The character basically was Jabba the Hutt, Princess Vespa, James Bond, and Q all rolled into one starting xp character.
This to me is an extension of the Dark Elf Assassin problem in D&D. Inevitably this character crops up, he is essentially the Cyberdyne Systems Model 101 series 800 with magic knives or swords (sometimes a whip) who has left the dark realm he was born to because killing has become too routine and boring there. He now wishes to travel to new places, meet exotic people and kill them.
The character is constructed to be a power fantasy of some kind, but has no room to really grow, and he player isn't interested in role-playing any kind of story about the character being at the top but finding something missing (rich but no friends, war but no victory, etc.). This to me always feel like the player is looking for manual stimulation of a kind I can't really describe here over several hours each session.
This is also combined with a sense that the character has already climbed his mountain, that the character will likely be in situations in the course of the game that are boring in comparison to the exploits they had off-screen in their background story. If the game is starting from humble beginnings this is that much more pronounced. And can you imagine the injustice of such an iconic character being defeated at the hands of anything less than Vader or the Emperor?
There are some times when a character like this is appropriate, and even desirable. But I feel like loading up a character with a big history of things just designed by the player to be used as a credit card is troublesome. It would be nice for some of the great things in the character's life to actually happen on screen, but this requires that the character actually do something great in the game, which I find rarely happens.
The character is pre-loaded with cool, yet so often they are the most boring character in the group. You know what they are going to do in situations, and you know the player is going to hit you up for constant goodies and recognition from their past. They are so established that they bow to no man, fear no enemy, and basically have seen it all before.
What, if anything, do you do as a GM when you are presented with a Mary Sue or Conan as King of Aquilonia but somehow at level 1? A character that is narratively greater than Luke Skywalker, but has the stats of a starting character is hard to represent. Do you just kind of ignore it and use the crazy person toolkit, or do you tell them to chuck that backstory and start over? I normally make the player rework these things but recently in the name of player agency I decided to let the princess have her backstory and just tried to roll with it, but it was very annoying. The other players complained about the character because they felt her character was ridiculous and because the player made his character like his personality instead of the character from the backstory.
Discussion: How do you handle this?
PS: I'm not asking for advice, I just want to discuss this. I just want to explore the topic. Thanks