Kenichi Kokuhou

Kenichi became lost in the mountains as a small child. A [foster father](https://anilist.co/character/20026/Genmai-Cha) raised Kenichi and taught him karate; when Kenichi was 15 the foster father told Kenichi about his background and the teenager returned to the civilized world alongside his trusty companion [Flipper](https://anilist.co/character/20017/Flipper). There he reunites with his biological family.
He possesses superhuman strength, but lacks knowledge and understanding of etiqeutte.

(Source: Wikipedia, edited)