Mezuki is an equine brute that can potentially be encountered in Atlus' 1994 Megami Tensei Gaiden: Rasuto Baiburu (Reincarnation of The Goddess Side Story: Last Bible) Sega Game Gear video game. Said title is an upgraded rendition (full color graphics, new enemy sprites, etc.) of the original gray-scale Nintendo Gameboy version released in 1992. Last Bible was also ported to the Gameboy Color in 1999 (without the Game Gear enhancements), which is also the only time that it was ever translated into English and released in North America (re-named Revelations: The Demon Slayer.) In the Gameboy versions, Mezuki wields a double-bladed scythe and sports a blue and purple color scheme. In comparison, the Game Gear incarnation, which is the look I went for with my model, has a more traditional scythe and a realistic brown coat (regardless of appearance, the monster still functions exactly the same in combat in all versions.) Like most of the creatures in the game, Mezuki can potentially be recruited into your party by (carefully) negotiating with him during a battle, or you might spontaneously create him by fusing two other monsters together with Kishe's "Combine" spell.
Mezuki (Horse-Face), and his partner, Gozuki (Ox-Head), are a pair of powerful Underworld guardians in Chinese mythology. When you die, Mezuki and Gozuki are typically the first supernatural entities that you meet; in fact, they often personally escort the souls of the recently deceased into the netherworld. It's also their duty to hunt down any wayward spirits that have somehow managed to avoid or escape the torments of the abyss. Once these lost souls have been found, and collected, the anthropomorphic duo drag them back to the Underworld so that they can be properly judged (and potentially punished, depending on how they conducted their mortal lives) before being reincarnated into a new form.
For comparison/informational purposes, below are some relevant images (more information on mouse-over):
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