The following is a list of unnamed Rigelians.
Female ambassador
This Rigelian ambassador participated in the meeting discussing the Coalition of Planets in 2155. She also witnessed John Frederick Paxton's actions against the aliens. (ENT: "Demons", "Terra Prime")
Kidnappers
These three Rigelians emerged from the shadows of the late night streets of San Francisco in 2155. They surprised Doctor Phlox and Ensign Hoshi Sato and wanted to take Phlox with them. Hoshi attacked one of the kidnappers and threw him over her shoulder while Phlox attacked the other one. The third came out of the shadows and knocked Hoshi and shot at Phlox. Hoshi was only able to see how the three took Phlox with them. (ENT: "Affliction")
Male ambassador
This Rigelian ambassador participated in the meeting discussing the Coalition of Planets in 2155 and witnessed the events involving John Frederick Paxton and Terra Prime. (ENT: "Demons", "Terra Prime")