Is there a way to use custom characters in gta v s single player campaign?

The single‑player mode of Grand Theft Auto V features three pre‑selected protagonists—Michael, Franklin, and Trevor. Players can switch between these characters during missions, but the game does not provide a mechanism to create or import custom characters. Customizable characters are a feature of Grand Theft Auto Online, the game's multiplayer component, where players can design a silent protagonist with various appearance and clothing options. There is no evidence in the provided source indicating that the single‑player campaign allows character creation or modification. Therefore, players wishing to use custom characters must play the online mode.