Maruo Moriyama (Kanji: 森山丸夫) is one of the four main characters in the Ponpoko 4-Kyoudai franchise.
In the 2006 anime, Maruo was a chubby tanuki. He wears a yellow short-sleeved V-neck shirt and a black coat with a mitsudomoe on its chest (the location of which is often inconsistent, though it's on the left in official artwork).
In the 2020 anime, he appears to have lost weight and now he wears his school uniform.
Maruo is generally very kind and generous to people.
Maruo loves his brothers more than anything in the whole world, and wouldn't give them up for anything.
Maruo and his brothers were on good terms with their father, albeit sometimes he ended up causing his own children more conflicts than he tried to resolve.
Maruo was devastated to hear about his father's passing, as he was there for him during most of his life up until that point. Despite this loss, he knows his father will always be there for them, as long as they remember him.
Maruo is deeply in love with Nanako, and is capable of doing anything to win her heart, even if it means getting himself in trouble.
Nanako breaks up with Maruo in the first episode of Shin Ponpoko 4-Kyoudai, but he later gets back with her in the third episode.
At the end of the series, Maruo finally marries Nanako upon graduating from college, just as she had promised.
When something happens between his brothers and Mr. Kumada, Maruo usually attempts to reason with him, mostly to no avail.
Maruo is often jealous of how close Toyotomi is to Nanako. While they're nothing more than friends, Maruo often believes that Toyotomi might be trying to steal Nanako from him.