Moezer

Moezer was an alien Starfleet ensign who was assigned to the USS Enterprise-D in 2364. Moezer had a skin color which changed from green to pink, sometimes wore a helmet, and served in the sciences division, standing watch at a post in transporter room 6. (TNG comic: "... Where No One Has Gone Before!")
 * Moezer appeared to wear a lieutenant insignia on his or her uniform despite being address as "ensign".