Or you could make one up. After all with 150+ members I doubt we've seen them all.
Good point. I'm doing this for the fun of being creative, so I might just do that.
This older thread has some different non-canon characters.
Please feel free to employ either of my characters. Lt. Jer'notta is of the species Try-la (she is a amphibian mermaid), and Ensign Doh-chil is a Walloppi (a quasi-millipede insect species). Or if you want just use people from their species.