Western is a Daimon Heart Snatcher sent by Mimet to extract Pure Hearts. She has a Western appearance and was created from a gun. She can wrap a lassoo around people, ride on a one-legged horse, and wields a pistol full of some substance that resembles paint. She appeared in Sailor Moon S Episode 23, Show Stoppers.
Mimet took Western with her in a briefcase to extract a Pure Heart from a movie star, Joshua Ita. She succeeded in sucking the Pure Heart out through his mouth and swallowing it. An attack from Sailor Uranus and Sailor Neptune nearly made her spit it out. Sailor Moon used Moon Spiral Heart Attack on her, but she was able to counter it easily, the first of many Heart Snatchers able to do so. When Sailor Moon transformed into Super Sailor Moon, she used the upgraded attack, Rainbow Moon Heart Ache, to destroy Western, releasing the Pure Heart unharmed.
In the Japanese version, her name is U-Estern, as most of Mimet's monsters' names begin with the letter U which is a pun for the word "Western," reflecting her Western-inspired appearance..