TV-Series
Description
Dekoppachi, a key supporting character introduced after the initial serialization, originated from the prototype Dabo in Fujio Akatsuka's 1962 one-shot *Chankichi-kun*. His name was formally adopted from the winning entry in a reader poll during the manga's serialization, appearing in issue #13 of the 1968 stories.

He appears as a young boy with a notably large, swollen forehead described as "as hard as rock," serving as both defense and comedy. His design features prominent facial moles, a bucktooth, and eyes often simplified to black dots. He typically wears simple clothing like a single-button shirt and pants, though spinoffs show alternative outfits.

Dekoppachi possesses a short temper, argumentative nature, and passionate demeanor. A strong sense of justice defines him, and he rarely abandons tasks or allies once committed. Despite his confrontational tendencies, he proves popular among neighborhood girls, sometimes rivaling Ataro, leading to conflicts or motivations. His stubbornness and refusal to concede defeat are recurring traits.

His backstory involves living in the ski resort area "Yukida" (reimagined as a hot spring resort in the 1990 anime) before meeting Ataro. Their encounter occurs when Ataro visits Yukida; impressed by Ataro's ghost-assisted skiing skills, Dekoppachi follows him back to Tokyo. After Ataro's father's death, Dekoppachi becomes Ataro's primary ally managing the Yao-Batsu vegetable store. Early friction arises from Dekoppachi's initial disbelief in the ghost father, though he later accepts the supernatural after witnessing events.

Relationships are central:
- His bond with Ataro shifts from rivalry to steadfast partnership, collaborating to protect Yao-Batsu from threats like the gang leader Kokoro Boss.
- Familial ties include a younger sister, Deko-chan, introduced in the spinoff *The Flower of Dekoppachi* and adapted into anime episodes 83 and 88. Stories involving her explore self-acceptance, as Dekoppachi disapproves of her resemblance to him while she remains confident.
- Romantic subplots involve multiple girls: Mina, a neglected robot maid deteriorating tragically due to his preference for the human Kako; Kako, an admirer inviting him to gatherings; and affluent girls like Matsubara-san (Sayuri in 1969 anime, Reina in 1990), causing jealousy between Dekoppachi and Ataro. Other brief connections include Tonko, an oden vendor, and Miko (Himeka Ayanokouji in 1990 anime), whom he tries to impress by lying about his status.
- Antagonistic dynamics feature rivals like Ganmo, seeking to undermine Dekoppachi's friendships and popularity.

Beyond the main series, Dekoppachi appears via Akatsuka's "Star System," featuring in spinoff manga *The Flower of Dekoppachi* – exploring scenarios like hotel work or sibling dynamics – and the short-lived *Gag + Gag*. He crosses over into other Akatsuka franchises like *Osomatsu-kun* and *The Genius Bakabon*, maintaining core traits in new contexts.

In animation:
- The 1969 anime introduces him earlier as a delinquent harassing Ataro before becoming his ally. It adapts spinoff stories like Mina's tragedy and adds original plots, such as a "Prince and Pauper" arc with a lookalike, Fujimaro Akatsukada.
- The 1990 anime reimagines his hometown as a hot spring resort and confirms his ability to see Ataro's ghost father, deepening supernatural involvement.

Throughout all media, Dekoppachi's development consistently centers on his loyalty, combative yet principled nature, and interactions within the broad ensemble cast.