They are generally less than two feet in height, come in an array of different colors, have large distinguished ears, stubby arms and legs, and sport a long, softly curved tail. Males and females have no noticeable dimorphism other than the females' long eyelashes. Moglins have the remarkable ability to swim with their ears, because their other appendages are too short.
They are often shy, home-caring, and friendly toward other friendly creatures. They like to eat about any amount of anything (except each other) and highly value fish, ice cream, or fish ice-cream. Sometimes, they follow adventurers around to heal them, give them advice, or just be protected; such is the case with Twilly.
They are all experts in magic, especially healing and rejuvenation and they are never reluctant to use it on needing creatures, whether good or evil (though they very rarely use it on evil.) Their innate healing ability is constantly healing them so they rarely if ever get sick and don't feel pain. However, as comfirmed by Dewlok, a Moglin's actual power is over life and death, and they show talent for both healing AND necromancy, such as the case with Zorbak and Kabroz.