Humanoid species from Trials in Tainted Space home to the tidally locked (one side constantly facing the sun, the other never sees it) world of Dhaal. Adapted to living in a low-light environment, they have universally dark skin tones, exceptionally long ears, and slightly luminescent eyes.
The zaika possess an unique biology. The species consists entirely out of hermaphrodites, but not in the way that they have both a vagina and a penis between their legs. Their pussy-like egg-slit is used only for birthing fully formed eggs. The primary sexual organ of the zaika is their tail. Depending on their mood the tip can either harden into a penis or open into a vaginal sheathe. (Still female due to TWYS)
Their nippleless faux breasts are in fact specialized organs that serve the purpose of testes in most other races and inflate as a reaction towards arousal. The hornier they are, the bigger their breasts get.
Also, zaika react towards breast milk like other races towards drugs, making it highly sought after product on Dhaal.

For more information:https://wiki.smutosaur.us/TiTS/Zaika