Ken (ケン Ken) is one of the antagonists in Shin Nekketsu Kōha: Kunio-tachi no Banka. He is the one responsible for the hit-and-run accident that Kunio and Riki were accused of. Growing up in an orphanage with no relatives, he was adopted by Sabu. Sabu held a grudge against Kunio for his previous defeat and told Ken that Kunio was his long lost brother.
Ken has a sibling named Akio. Akio was riding in the bike with Ken and impersonated Riki.
Ken is a member of the Japan team in River City Super Sports Challenge ~All Stars Special~ and its sequel, River City Melee: Battle Royal Special.