How to satisfy a player character's curiosity about another player character?

The first thing I would say is that In the first campaign of critical role the players characters had known each other for about 2 years of game time and still, despite what he may think he sees, keep secrets from each other, are guarded and hide things. Especially for about the first 50 episodes (150+ hours of gameplay) that means 3 years of gameplay while still keeping secrets from each other about there own backstory.

This may also be a side effect of movie watching, the saving private Ryan effect I call it a player thinks it is right to go into a deep and meaningful exposition of there life just before a big boss battle in case they die. This is something I have seen happen that predates critical role.

Sit down with the player and ask him to think about the situation, this is a group of people living in a high stress high intensity environment. Probably lacking trust, in real life would you unveil your deepest darkest secrets to someone who asked you, especially in a stressful situation. Now consider those secrets may get you killed, get someone else killed, involve the murder of someone. They might be to painful to bring up right now, or somthing the character wants to forget. They may simply not like chit chat.

Maybe his character is the kind who overshares and gives a lot of himself emotionally, ask the player to think about how that can be recieved in the real world and not to be surprised or upset when other party members clam up or shut him down. The key thing is communication. If he loves critical role so much then ask him to look for some of Matt Mercer’s discussions about issues like this, on several occasions Matt has talked about the need for players to sit together and decide how they want to tell there own story, how it won’t be the same as critical roles. He talks about even his own group constantly have to touch base outside of game, give a warning that there character may be about to do or say or act in a way ay that is negative, angry or even romantic to another players character and just make sure, is this ok, will I be crossing boundaries before I do this thing.

I remember my first character in my first campaign. I was new and thought that I had a well fleshed out character, creating a rogue who lived alone in the wild all his life. However, my DM had a good talk with me and asked me my wants out of the game and what I thought of characters to be. He explained to me the difference between creating a "hero" and creating a "party member" and helped me tone down my character. We continued to talk through the campaign and I was wondering how my character could get to know the others, which he explained a couple of things.

1. I was joining a sit-and-play game which is great for getting your feet wet but kinda is hard to get involved in when people come and go every week. However, normally he starts off a campaign (if he knows it's a play-to-the-end kinda game) by having everyone introduce their characters to the other players as he sets up a scenario to bind the party together.

2. Some characters are open and some are reserved, so if a player chooses not to share about their character, it's within their rights. (I used that later on creating another character who was shy about his race). However, it's best to talk to people while you're idly traveling or camping.

3. The DM is the master of all possibilities. Yes, it is his job to create a fun experience, and going by the book can help guide the quest, but a DM can modify any part they want at any time. He used this power sparingly to help the game progress, either to create consequences for problematic players or to create events to keep the story going.

4. When in doubt, ask, don't tell your DM things. Basically, it's a player's job to focus on living vicariously through their character and the DM's job to paint the scene. If a player is too focused on how the DM is working, then they should be more wary about what their character is doing.

and 5. The DM's job is to please the table, not the player. In other words, you can't make everyone happy, so focus on making the group happy in general and (he says) the players will start controlling events to help you out (like a fighter hitting an annoying goblin player because it's both in character and the player is annoyed). These are the fun times in a campaign.

(again those are his words of wisdom I just wanted to share.)

My suggestion is to use a bit of DM magic to refocus his character. For instance, in your example

His approach to learning about the other characters is somewhat unorthodox. He will wait until they are chased down a mountain by a band of orcs and are hiding in the lowlands under cover of darkness to talk about his bedroll, and will go out of his way to ask the other characters what they think about his family crest that adorns the otherwise plain blue bedsheet that he keeps throughout his adventures. The other characters, recognizing the potential danger they are in, pay little mind to his antics, which actively frustrates the player of the half-elf bard, who feels as though it should evoke the other players to share their backstories.

Wait until he is done talking and DM something like "As the bard poetically speaks, a rock flies silently through the night and lands on the bard's head, causing (1d4) damage. It seems that the orcs are closing in and are very attentive to sound."

I remember a similar situation where my DM pulled this. When accused of a personal attack he simply said "Not at all, the orcs are coming and they heard you. They simply threw a rock towards the sound to see what would happen. Are you getting up to tell them they are being cruel?"

I think that, as a player, it's a great way for a DM to give gentle reminders of the severity of a current situation. Later, when your party is camping for the night, you can ask your bard if he's going to try again to familiarize himself with the party, as this would be a good time to do so.

Hope that helps

It's a funny thing, isn't it, how things we ought to do and probably wouldn't think twice about become an issue when someone demands they happen? In this case, most GMs and many players want to share information and details to enhance game play, camaraderie, etc. And there are many questions pertaining to "My Guys" who are excessively uncommunicative loners.

And yet, I see the problem this presents: It is awkward. Here are three specific things I think your potentially troublesome player is doing that make things awkward, and they are all at the meta (player behavior) level rather than the in-game (character behavior) level:

1. He is effectively telling the other players how to play their characters:

   The other characters, recognizing the potential danger they are in, pay little mind to his antics, which actively frustrates the player of the half-elf bard, who feels as though it should evoke the other players to share their backstories.

2. He is effectively telling you how to GM:

   He has even told me several times that it's my responsibility as a DM to prompt the characters to recount their lives to the other characters in the adventure.

3. He is, as you have pointed out yourself, usurping your role as the GM:

   The half-elf bard still wants to know more about these people he finds himself adventuring with, and continues to interrupt the pacing of various scenes by playing "temp DM" and coloring it like he's doing me a favor

All of these are intensely annoying and disruptive to a game, even when the player is pushing in a direction you might want to go, unless he has your permission or solicitation to do so. (It is pretty clear that he is not actually pushing in a direction you want to go.)

Couple this with the basic structure of your game, which has built in a bunch of characters with hidden pasts that they have reason to keep hidden and that you are reluctant to reveal ahead of their time. This may or may not be a wise decision or campaign structure, but that is not your question. Your question is whether you can satisfy the "cagey loners" and the "everybody's best friend" at the same time.

It seems to me the answer is no: These are in direct opposition to each other, a zero sum game. Someone is going to "win" this struggle, and someone is going to "lose."

My inclination would be to tell the player bluntly to let the other players play their characters, let you make the GM-ing decisions, and maybe stop irritating everyone in the process.

Have an out-of-game discussion with your players about expectations.

This is a common issue with TTRPGs, especially with newer groups: When people bring their own preconceptions and expectations, they often end up trying to play different games, which causes a clash of playstyles and a frustrated table dynamic. And when one player's style is radically different from the others, they may end up becoming a problem player, even if they intend no harm.

It seems like your player has narrow preconceptions of D&D based entirely on a very specific DM and a very specific playstyle, and not from their own experience. In reality, there are many fun ways to run a D&D game, and very few of them involve mimicking Mercer et al.

You need to establish expectations with your players. Explain to your players that you are not Matt Mercer, nor are you any of their previous DMs (if any). You have your own way of running a game, and that's fine, you just need to communicate your style to them.

When having this out-of-game discussion, here are some example questions for you and your players:

• Lost Mine of Phandelver is heavy on combat and danger. How much should the session focus on roleplay and inter-character dialogue?
• Is the DM going to stick to the Lost Mine of Phandelver campaign content, or will they deviate to explore PC backstories and sideplots?
• D&D typically assumes the PCs have trust and party cohesion. How do you balance a PC's secrets with their willingness to trust other PCs?
• What tone does the group want (grimdark, heroic, goofy, etc.) and how should they approach alignment and morality?
• What forms of meta-gaming are acceptable or unacceptable?
• You're a relatively new DM. What counts as acceptable suggestions from the players, versus unwanted backseat DMing?

For more questions, you may want to check out the same page tool for establishing expectations. The tool itself is a bit simplistic, but it may give you some inspiration of what topics you want to discuss.

One common method for discussing expectations is to organize a Session zero. Typically this conversation occurs before the campaign, but your current issues at the table suggest you should have this discussion ASAP.

That being said, it's still encouraged to make some accommodations for your players. If the bard wants an opportunity to discuss backstories, that's fine, just give them an indication of when. For example, maybe throw in some slow-paced scenes (such as during short or long rests) when the player characters can have these sort of personal story dialogues.