OVA
Description
Dekapan is a recurring character originating from the Osomatsu-kun series, created by manga artist Fujio Akatsuka's assistant, Kenichiro Takai when tasked with developing new cast members. His name, meaning "large pants," was chosen through a reader column in Shonen Sunday magazine.

He is a short, heavyset, and brawny middle-aged man, almost always depicted wearing his distinctive large, striped boxer shorts. His appearance includes a bald head with sparse hairs arranged in a "Mt. Fuji" style, crow's feet wrinkles around his eyes, a thick black mustache, and a single prominent bucktooth. His functionally wide boxer shorts can store various objects, tools, money, food, and even live animals like cats or dogs, though they are not super-dimensional.

Dekapan is most commonly a mild-mannered, friendly, and big-hearted "uncle"-type figure, a contrast to the more flamboyant Iyami. He is generally easy-going and eccentric, often taking on various professional roles such as a doctor, millionaire, policeman, or scientist as the story requires. He has a fondness for animals, frequently accompanied by a pet dog or cat he calls "Boya." However, within the star system of Akatsuka's works, his characterization is flexible; he can also be depicted in a more villainous or cold role, such as a mafia boss, particularly when Iyami is positioned as a hero. In some stories, he has been shown to treat a child similarly to how he would treat an animal.

His speech patterns include a frequent use of the chuckle "hoe hoe" and ending sentences with the verbal tic "-dasu."

Dekapan is typically a side character who supports others, whether altruistically or as a villain. Official profiles state he has no family, though this is often altered for specific plots. He has occasionally been depicted as a father or uncle figure to characters like Chibita, Hatabō, or Totoko. Rare instances show him with a wife and a young son named Tarō, who resembles him but wears pink-and-white striped boxers, or with other one-time children in different story contexts.

The character appears across a wide range of Fujio Akatsuka's works beyond Osomatsu-kun, including manga such as The Genius Bakabon, Extraordinary Ataro, and Cat's Eye News. In animated adaptations, he appears in the 1966, 1988, and 2017 Osomatsu-kun productions, as well as in the spin-off series Osomatsu-san.