Reframe A Problem Character Concept Into Something Playable

Someone always pitches the brooding loner who works alone, and someone always has to explain why that does not work in a four person party. This keeps what the player actually wanted from the concept and reworks it into a character who stays in scenes and has reasons to need the party.

A player has pitched a character concept for {SYSTEM} that will not work well at the table: [describe the problematic concept, for example a loner who refuses to work with the party]. Keep the emotional core of the concept but rework it into a version that stays engaged with the group and does not require the game master to build special scenes around one player. Give the reworked concept in one paragraph, then list two concrete hooks that tie it into the other characters.