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

According to the Wikipedia entry for Grand Theft Auto Online, the online component of Grand Theft Auto V, players are described as controlling a customizable silent protagonist. The article does not mention any feature that allows players to choose or play as characters from the single‑player story mode such as Michael, Franklin, or Trevor. Therefore, based on the available evidence, there is no indication that story mode characters are available as playable options in GTA Online.