How are online and story mode characters linked in gta v?

Grand Theft Auto V’s single‑player story follows three main characters: Michael De Santa, Franklin Clinton, and Trevor Philips. They are the only protagonists described in the available information. There is no mention of characters from GTA Online, nor any explanation of how, if at all, story mode characters are connected to online mode characters. Consequently, based solely on the supplied evidence, a link between online and story mode characters cannot be established.