Moro appears as a large humanoid goat with blue skin and two horns on the sides of his head that curl around to point forward near his cheeks. He has long pointy ears, long dark nails and tufts of fur on his shoulders. He dresses in long red robes with a hood and has baggy dark pants with a fur pelt wrapped around his waist and white bandages around his wrists and ankles.
After eons of imprisonment and drained of most of his power, he appears very elderly, as he stands in a slouching-pose and has noticeable wrinkles with a scrawny, if not malnourished, frame, and a long white beard reaching his abdomen. After absorbing all of Goku and Vegeta's energy, Moro became noticeably younger-looking with proper posture and few wrinkles. He also became fairly muscular and his beard shrunk dramatically to a more manageable length. After taking almost all of Namek's energy, Moro's beard shrunk even more. Once he absorbed the last bit of life energy on New Namek, Moro's beard disappeared while regaining a very youthful and well-muscled appearance.
Moro is extremely greedy, heartless and selfish who has no respect for life in general and cares for no one but himself. Rather, he views all living things as food for his pleasure and scoffs at people who try to stop him. He speaks in a calm, collected tone. He is very deceitful and manipulative, having used Cranberry to help restore his power and immediately eliminating him after he outlived his usefulness, as well as feigning his weakness until he was able to absorb enough of Vegeta's energy to defeat him.
His calm demeanor, however, gives way to extreme rage when in the presence of the Grand Supreme Kai, since he has harbored a grudge against him for eons.
Moro holds a strong command and does not like it when his subordinates act on their own. This is seen when the Macareni Gang go to Earth without informing Moro beforehand, and upon learning this, Moro sent a scouting party to search the planet and ordered Shimorekka to kill the Macareni Gang, stating traitors acting on their own are expendable.