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Masaki (まさき Masaki) is a supporting character in Shodai Nekketsu Kōha Kunio-kun. Masaki is one of the Osaka Shitennō, who rules over Ebisuchō. He is known as Masaki the Jinkokuten. He is Miho's older brother. Although his fighting potential is high, he never uses it to his full extent, as he is a strong believer of justice and dislikes violence. Despite this, he joined the Osaka Union, as he did not want Miho and his friends to be in danger. After meeting Kunio, he is eventually persuaded to change his mind and turns on the Union.
Masaki is mentioned by Miho in River City Melee: Battle Royal Special.