Shinji Sekiguchi(Sekiguchi Shinji, 関口 しんじ) is a male third-grade character from the Japanese manga and anime series 'Chibi Maruko Chan'.


Sekiguchi appears to be bald, save for numerous strands of short hair that are visible on his head.

He most often wears a light brown long-sleeved shirt with a V-shaped collar and an embroidered shield image on the upper left area of the shirt, coloured yellow and blue whilst outlined in white. His white undershirt can be seen underneath the shirt's collar. He also sports olive-green shorts, white socks and light brown shoes the same shade as his shirt's colour.


Sekiguchi is one of the classes' most confident and noisy students, prominent in earlier episodes especially for giving critical opinions and pointing out the attitudes of others in some class discussions. He may seem to fit the bully archetype, as he enjoys mocking others for his amusement, and play-fighting amongst his group of friends.

However there are times where Sekiguchi been considered of great help to others, one instance being when he taught Maruko how to ride a bike for the first time.

Hobbies & TalentsEdit

Sekiguchi appears to enjoy many activities relative to boys' interests which range from sports to role-playing fight situations and teasing others. 





  • Sekiguchi-kun's favorite foods are yakitori and cup ramen.
  • Sekiguchi-kun's favorite musical acts are Mari Imachi and the band Zutorubi.
  • Sekiguchi-kun is left-handed.
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