Are story mode characters available in gta online missions?

Grand Theft Auto V’s story mode and GTA Online are distinct game modes. The story mode features the three protagonists—Michael, Franklin, and Trevor—who are only playable during the single‑player campaign. GTA Online has its own roster of playable characters, each with unique missions and gameplay. While certain events have introduced cameo appearances of story mode characters as non‑playable figures or in limited cross‑over content, no official source states that they become playable within standard GTA Online missions. Therefore, based on publicly available information, story mode characters are not generally available as playable characters in GTA Online missions.