Nb'alk are a sexless race that are visually indistinguishable from human females when clothed. They have the same range of skin/hair/ eye colours as human women do, but they have no genitalia, no anus, no urethra, and no bellybutton. They do possess boobs, but they have no areola and no nipples. They also lack internal digestive or reproductive organs. Nb'alk don't need to eat or drink, but they still enjoy it. Any food or drink they ingest will disappear upon reaching the bottom of their throat. Before Nb'alk arrived on Earth, they had no concept of sex or genitalia. And only learned about them after landing on Earth, though most find it silly or funny.

They still do not consider their butt, breasts, crotch, to be private or inappropriate to touch, and aren't really bothered if they are seen nude. They find it silly that humans consider certain body part to be private.

Nb'alk have no libido, and cannot experience sexual pleasure or sexual stimulation, as their bodies lack erogenous areas. Nb'alk came to Earth after their planet was destroyed when it's star expanded, now they live as equals among humans. When clothed Nb'alk, an Nb'alk is visually indistinguishable from a human woman, as the only differences are their lack of internal and external reproductive organs, their lack of digestive organs, including having no anus or urethra, and lack of a bellybutton, all of which are concealed when they wear clothing. Nb'alk are born from pods that grow in Nb'alk soil, which is only found in the Nb'alk mothership. They have no sweat glands, and so do not sweat. Nb'alk only wear clothes because humans don't like public nudity, though they don't understand why. Nb'alk who are newly emerged from their pods are often adopted by other Nb'alk or sometimes humans, so if an Nb'alk has any human family, it's because they were adopted.

It's not uncommon for Nb'alk to date humans, and they are capable of falling in love.