Character Information
Name: Riki Samejima
Name (kanji/kana): 鮫島 力
Localized Name(s) Jack


Riki Samejima (鮫島 力, Samejima Riki) is the guardian of Hanazono High School and the second most recurring character in Kunio-kun series. He first appears in Nekketsu Kōha Kunio-kun as the first stage boss. He is an eternal rival of Kunio.

Localized versions

  • In Renegade, Riki is known as Jack.
  • In NES version of Super Dodge Ball, he is also known as Jack, a captain of Team Pro All-Star.
  • In River City Ransom, Riki was name Ryan.
  • In Crash 'n the Boys: Street Challenge, Riki was named Crush, a member of Team Thornley, who replaces a black character named Raphael.
  • In River City Ransom Underground Ryan's full name was Ryan Samejima.


  • Riki has a two girlfriends, the one is Mami from Downtown Nekketsu series, while other one is Kyoko from Kunio-tachi no Banka.
  • The character Kazuma Kuwabara from the anime Yu Yu Hakusho bares a resemblance to him especially his hairstyle.
  • Riki's birthday is on May 5.


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