Xixchil

Xixchil hail from the Spelljammer setting and can be basically described as "what if Thri-kreen were green and had a racial penchant for mad science body-modding?" Hailing from some sort of Death World, they had to be smart and work together to survive, eventually taking over the world when they figured out how to use surgery and alchemy to reshape their bodies. They casually tinker with their own bodies all the time, from the aesthetic - surgically implanted gems and precious metal - to the functional, like implanted poison-needle-guns. In fact, their "religion" is basically that the body is the house of the soul, so you have to personalize your house. They sell all kinds of weird critters and plants to curious folks, like kittens with wings and birds that grow flowers, and they also offer unparalleled surgical skills. Want to replace a missing limb? Add a new arm? Change sex? Grow wings? They can do all that shit and more. Only problem is, they have a very "function equals form" mentality and little understanding of demihuman aesthetics, so unless you're very specific, well, you might end up getting screwed over appearance-wise in exchange for your uber-buff.

http://www.lomion.de/cmm/xixchil.php - 2e Monster Manual Entry