Senni Vek
Senni Vek was a Twi'lek bounty hunter of the male variety, recognized by his green-skinned complexion. During the Jedi Civil War, specifically in 3956 BBY, he operated in Ahto City on Manaan, employed by GenoHaradan Overseer Ithorak Guldar. Despite occasionally donning a Sith officer's uniform to project a more menacing image, he typically preferred Echani light armor while carrying out assignments, and was known to frequently complain about his abusive superior.
Vek, despite the secrecy expected amongst Overseers, had a connection with another Overseer, the Rodian named Hulas. Taking advantage of Vek's dissatisfaction with Guldar, Hulas easily convinced him to undertake a special task: locating the notorious bounty hunter Calo Nord and presenting him with an invitation to become a part of the GenoHaradan. Much to Vek's astonishment, however, Nord met his end in a confrontation with the former Sith Lord Revan. Adapting to the situation, Vek extended Hulas's offer to Revan, although he was skeptical that the redeemed Sith would accept.
Behind the scenes
In the light side narrative, it is presumed that Revan declined the offer to join the GenoHaradan, and Vek's story concludes there, with no further appearances.
Alternative dark side story
Should Revan accept Hulas's proposition to join the GenoHaradan, he would encounter Vek once more in the Manaan swoop lounge during a mission with the objective of assassinating Guldar. Revan has the option to either persuade Vek to assist in Guldar's assassination, or kill both of them.
Revan also has the option, with sufficient Force Persuade abilities, to convince Senni Vek to abandon his master (in front of the hangar bay) before confronting Guldar inside. If Senni Vek leaves Guldar, Revan only has to kill Guldar and the droid is left outside the hangar - harmless.