Does gta online allow you to use characters from the single player campaign?

The available data does not provide explicit confirmation about using single‑player campaign characters in GTA Online. Generally, GTA Online features its own character creation system separate from the story mode. Players create a custom character that is used exclusively in the online multiplayer environment. Because the evidence is lacking, we cannot assert definitively that campaign characters cannot be used, nor can we state they can. Further verification from official sources or gameplay documentation would be required to resolve this question.