The scruffy, Spanish-speaking Emergency Tactical Hologram of La Sirena, who mans the weapons when the ship is attacked over Vashti in 2399 and resembles a wilder version of Rios.
Emmet is the tactical programme among the five emergency holograms of La Sirena, all modelled on Cristobal Rios and played by Santiago Cabrera. He is the least polished of them, unkempt and laconic, and he speaks to his captain mostly in Spanish.
He is seen in Absolute Candor when an old Romulan Bird-of-Prey attacks the ship above Vashti, lounging at the weapons station while Rios flies. He appears again in Broken Pieces, when Raffi calls up every hologram to find out why the sight of Soji has shaken Rios so badly.
Emmet contributes little to that conversation beyond a few words, but the scene establishes that all five programmes had the same memories deleted by Rios after the ibn Majid incident.