I found myself browsing through the character tag, and I think it needs a lot of help. I'm not sure it can be saved, but I'll outline the problems I'm seeing and maybe the community can come up with some good solutions.
Tag Description Overlap
First, we've got some tag overlap based on tag descriptions:
For questions primarily about characters. A character is being controlled in the game either by a player (player character) or the gamemaster (non-player character).
NPC (non-player characters) refers to any character in an RPG whose decisions and actions are handled by the game master (or a designated assistant) rather than by a player.
For questions about strictly, or primarily, adversarial characters controlled by the game master, use monsters. Or for the main adversarial character(s) see villain For questions about characters controlled by the game master, but who acts alongside the player characters see gmpc.
For questions relating to characters controlled by players rather than by a game master.
Of these three, npc has by far the best guidance. It defines its scope, and has guidance for when to use an alternative tag instead. On the other hand, character and player-characters have nearly identical descriptions, except that character says it can also be about NPCs. I think we would prefer questions about NPCs to use the npc tag. Upon reviewing how the other tags are being used, it seems the rarely used (7 questions) player-characters tag is being used identically to one of the ways we are using the character tag. I say "one of the ways" because character is getting applied to a lot of stuff, which brings me to the second problem...
It seems to me that character has more or less lost all its meaning because it has been applied to all sort of questions, really any time a player's character is mentioned, you might find the tag, even if the questions has nothing to do with the concept or idea of a character. For example, consider this question: Can one PC throw another?. This question is about the mechanics of throwing a person. It's a question about the mechanics of something a character does, not a question about characters. To give a rough estimate, it looks like around 28 out of the 80 open questions with the tag follow this pattern.
Next, 17 out of 80 open questions with character are cotagged with character-creation. It is not clear to me that any of these 17 questions are different from the other 1,310 questions in the character-creation tag that aren't cotagged character (as well as some questions tagged character that were about character creation that didn't have the tag for it). Some of them might be, but the purpose of character is pretty unclear to me at this point, so I don't know.
Next, most of the remaining questions that don't fit into the two bins above are specifically about player characters and how the players relate to their characters.
One more thing, 45 out of 125 questions with the tag have been closed, only 7 as duplicates. I'm not sure what to do with that, but it seems like an unusually high proportion.
All that said, I don't really have any idea what this tag is for, and unless someone has some good ideas for fixing it, retagging with player-characters and npc where appropriate and then burninating it might not be a bad idea.
Update March 10, 2022
Based on the unanimous voting pattern on my answer below, I have begun removing character from the mechanical questions that weren't about the concept of player characters (see the answer for a list). Once I've finished, I'll notify the moderators to have them merge character and player-characters. Keeping the pace at a modest five per day, I should be finished in less than a week.