Sen, Momo, Ai & Syy's Channel

The handle combines two Japanese words: oyabaka (親バカ), a term for a parent who dotes excessively and proudly on their children, and tousan, which simply means dad or father. Together it translates roughly to 'doting dad,' which perfectly describes the channel's premise — a father documenting and celebrating his four kids' everyday adventures.

The four siblings use shortened nicknames on the channel: Sen's full name is Sennosuke, Momo is Momoko, Ai is Aiko, and Syy is Shiro. The channel description lists all four names alongside their birthdays, giving long-time fans a personal connection to each sibling.

The channel is managed by the children's father, as stated directly in the YouTube channel description. His Instagram bio also describes himself as someone who posts 'oyabaka videos on YouTube,' confirming he is the one behind the camera and the uploads rather than the kids themselves.

As of mid-2026, Sen (Sennosuke, born May 2006) is 20 years old and Momo (Momoko, born May 2008) is 18 — both have essentially grown up in front of the camera. The two younger siblings, Ai (Aiko, born July 2014) and Syy (Shiro, born May 2017), are around 11 and 9 respectively.

Yes, USJ features in the channel's content, with hashtags like #USJ, #Minions, and #ミニオンズフィーバー (Minions Fever) appearing in their posts. Theme park trips are a recurring pillar of the channel alongside family vlogs and cooking videos.

Baking is a notable and recurring part of their content. The family has made themed treats including Chibi Godzilla cookies, marshmallow seals, baking chocolate, and Christmas tree cakes, blending family fun with hands-on food creativity that clearly resonates with their largely female audience.

Huis Ten Bosch (ハウステンボス), the Dutch-themed amusement park in Nagasaki, appears in the channel's hashtags alongside #長崎, confirming the family filmed content there. Theme park trips to destinations across Japan are a signature type of video on their channel.

Yes, Nijigen no Mori (ニジゲンノモリ), the anime theme park on Awaji Island, appears in their content hashtags, including a reference to the Godzilla Intercept Operation attraction (#ゴジラ迎撃作戦). It fits naturally into their pattern of filming family experiences at well-known Japanese theme parks and attractions.

The channel is almost entirely domestic — the overwhelming majority of their audience is based in Japan. Despite the English-language channel description welcoming international viewers, the content is produced in Japanese and has built its massive following almost exclusively within Japan.

The channel has surpassed 11 million subscribers on YouTube, placing it firmly in the Mega tier of creators. YouTube is by far their dominant platform, with their Instagram presence remaining comparatively small, reflecting how central long-form family vlog content is to their identity.