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Mizoguchi (溝口, みぞぐち Mizoguchi), full name Mizoguchi Kōki (溝口光輝, みぞぐち こうき Mizoguchi Kōki) is Kobayashi's ally in the upcoming Stay Cool, Kobayashi-san!: A River City Ransom Story.

Kunio-kun characters
Main characters KunioRiki
Nekketsu Kōha Kunio-kun HiroshiTōruAkiraShinjiTakeshiMisuzuKumikoSabu
Nekketsu Kōkō Dodgeball Bu ShinichiKōjiMitsuhiroIchirōAkishiNaritakaHeilmanLao ChenMordovWilliam
Downtown Nekketsu Monogatari HasebeYamadaMamiRyūichiRyūjiGōdaGodaiOnizukaKobayashiMochizukiTairaKinoshitaNishimuraSawaguchiSonokawaKamijōYamamoto
Downtown Nekketsu Kōshinkyoku SugataNanaseMomozonoIchijōTakamineMorimotoMaedaYoshinoSaotomeWashioShimizuTōdōHayasakaOtonashiAiharaKumadaHayamiKirishimaMorisawaKōzuki
Kunio-kun no Jidaigeki MatsudoNedachiSankichi
Bikkuri Nekketsu Shin Kiroku JohnnyRaphaelJimmyKōnosukeAlex
Downtown Nekketsu Baseball Monogatari TachibanaRikaKunikoNishinoReikaMurasakiFubukiKazaokaTsugeTsukasa
Nekketsu Kōkō Dodgeball Bu: Soccer Hen MisakoTakashiMasaGenei
Ike Ike! Nekketsu Hockey Bu YōichiHidekiTsuyoshiMasashiKaoriTōruSadaoYōkoToyoichiHideTobiyama
Nekketsu Kakutō Densetsu EbiharaAoiHimeyamaOkumaToraichiToraji
Shodai Nekketsu Kōha Kunio-kun YoshihiroMihoMasakiHondaHokutoUrabe
Shin Nekketsu Kōha: Kunio-tachi no Banka KyōkoTakayamaMamoruKōjiTōruDaikiRyūtaKenAkioNobuLisaKinjiJoe
Downtown Nekketsu Monogatari EX SaoriHimada
River City Super Sports Challenge Michael TobiokaTomorinSierraStanislav
Nekketsu Kōha Kunio-kun Special YūyaToshioMadokaPrincipalWataruMikotoMiyukiFatherKatsujiTetsu
Riki Densetsu SakataOkadaMaezawaMegumiGonda
River City: Tokyo Rumble GinjishiMajishiBenijishiUkyōSakyōShishiōKinshishiLee
River City: Rival Showdown NagatsukaChihoShioriŌtaMinamotoRinaMakotoMinoriMikaShinoda
River City Melee: Battle Royal Special TsubakiMiyakodaShimokitaMiyagasakiNakaSumi
Live-action series TadokoroYumeko
River City Ransom: Underground GlenBrunoProviePaulMikeRudyMervChrisPurple BeePink BeeCalvinEtherAlexisAdamWesProtoDr. DSentinel
River City Girls HibariNoizeSabuko
River City Melee Mach!! AijimaYokomizoNishiwaki
Stay Cool, Kobayashi-san! MizoguchiYamadaTakeruSayoNo. 21No. 29No. 47No. 35
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