Can you customize story mode characters in gta online?

Grand Theft Auto Online is a standalone online multiplayer component of Grand Theft Auto V that launched in 2013. While the game allows players to create and customize their own silent protagonist character in Online mode, this customization is entirely separate from the story mode characters from the single-player campaign. The Wikipedia excerpt confirms players control a 'customisable silent pr...' character in Online, but this refers to the player-created avatar, not the existing story characters. The story mode characters remain fixed as part of the single-player narrative and are not accessible or modifiable in the online environment.