How to get gta iv dlc characters in gta online?
Quick Answer
There is currently no way to get GTA IV DLC characters in GTA Online, as the two games are separate titles and the online component does not support importing characters from GTA IV.
Explanation
Grand Theft Auto Online is the online multiplayer component of Grand Theft Auto V, and it runs on its own engine and content framework separate from Grand Theft Auto IV. Rockstar has not released any cross‑game character import feature that would allow characters from the GTA IV DLCs to appear within GTA Online. All characters, missions, and DLC content in GTA Online are created specifically for that title. Because GTA IV and GTA Online are distinct games with different code bases, there is no supported method to transfer or unlock GTA IV DLC characters for use in the online mode. Therefore, players looking to use GTA IV characters in GTA Online will not find a legitimate way to do so.