The Reddit user with the handle RebelScumLeia has identified another actress who could have provided both the appearance and voice for Lucia in GTA 6. The Redditor believes that the character was played by Manni L. Perez:
Lucia resembles Manni not only in appearance but also in
voice;
In 2021, the actress revealed that she was working on a major
project, which she couldn't discuss due to a NDA;
The actress played a role in the show Law & Order, where
other actors also provided the appearance for Trevor and Michael
from GTA 5 and Arthur Morgan from Red Dead Redemption 2;
Manni voiced one of the unnamed NPCs in Grand Theft Auto 5.
There's also an opinion circulating online that Lucia was played by actress Anna Esposito. Grand Theft Auto 6 will be released in 2025 exclusively for PS5 and Xbox Series X/S.