A rabbit-like alien from the moon, Uko flees to the Earth in an attempt to find freedom and self-expression. She's independent and adventurous to a fault, and often needs Hane's help to bail her out of awkward social situations. Her eager naivety is infectious, however, and those around her end up appreciating her company. Her unique rabbit-like trait is having an herbivorous stomach, which causes stomach issues whenever she eats any meat.