Mudo is a boy in Sunao's class. He took an early liking towards Potemayo, though has not been able to even pet Potemayo. On Valentine's Day in his second year of junior high school, he accidentally gave chocolate to Nene, which later caused him to become her slave for a time. Mudo is in the cheerleading club, and will dress up in a full female cheerleader uniform during club activities. A running gag is Mudo getting severely hurt, in many cases by the exploits of Guchuko. He seems to thinks Nene is cute when she does not talk at all.

(Source: Wikipedia)

Sunao Moriyama finds a strange but cute creature that he names Potemayo. Potemayo starts following him everywhere, usually riding on top of his head. His discovery becomes the center of attention in his class at school. Soon after, a similar creature appears, and is named Guchuko by one of Sunao's classmates. However, Guchuko doesn't seem to be as good-natured as Potemayo.
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(Source: Anime News Network)

Mudo Kirihara