Are the story mode protagonists available as playable characters in gta online?

Grand Theft Auto Online is the multiplayer component of Grand Theft Auto V, developed by Rockstar North and published by Rockstar Games. The game allows up to 30 players to explore the open world of San Andreas and participate in cooperative or competitive missions. The Wikipedia entry for GTA Online does not mention the story mode protagonists—Michael De Santa, Franklin Clinton, or Trevor Philips—as playable characters within the online mode. Consequently, based on the available verified source, the protagonists are not available as playable characters in GTA Online.