Is there any way to use michael franklin or trevor in gta online?

Grand Theft Auto Online is described as an online multiplayer action‑adventure game that allows players to create and customize their own characters, explore the open world of San Andreas, and engage in various cooperative or competitive modes. The article does not mention any inclusion of the single‑player protagonists from Grand Theft Auto V, such as Michael Franklin or Trevor. Consequently, based on the available information, there is no supported way to use those characters within GTA Online.