Nekovalkyrja can tan! It's optional (I imagine it's a setting).
Nekovalkyrja are a highly adaptable species that are designed to maintain at least a passing compatibility with humans. Their physical appearance is customizable. Essentially, Nekovalkyrja has access, via the Nekovalkyrja OS, to an MMORPG-style character creator menu and can alter their appearance in this menu and the nano and femtomachines that make up the cells of their bodies will begin to change their outward appearance and within minutes they can have a completely different skin tone, hair color, eye color, and so on. As a species designed to live in spaceships, the Nekovalkyrja were designed to be especially resistant to radiation damage including UVA and UVB rays...