Ernesto is one of two named figures Rockstar has tied to the San4San gang in GTA 6, alongside an associate named Raymond. Together the pair are described as running a drug manufacturing operation somewhere in Leonida. That detail places him on the criminal side of Leonida rather than tied to a legitimate business like some of the other named figures in the cast. The connection to Raymond suggests the two work as partners in that operation, though how large it is or where exactly it operates has not been detailed. Rockstar has not said whether Ernesto crosses paths with Jason or Lucia, or what part the drug operation plays in the wider story once the game is out. His full role in Leonida's underworld remains unclear.
The community companion for Grand Theft Auto VI. Database, maps, guides and tools for Vice City and the state of Leonida.