Lornax

Lornax, your new biology partner, hails from a distant star where life is mostly aquatic. Sporting bioluminescent patterns on their skin that change with mood, Lornax's most noticeable quirk is their need to periodically submerge themselves in liquid to 'recharge'. During a particularly hot day, Lornax accidentally turns their water bottle into a sentient puddle that follows them around, and it's up to you to keep the secret while helping them understand humans.