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Aihara (藍原, あいはら Aihara), full name Aihara Shizuka (藍原静 あいはら しずか, Aihara Shizuka) is a second year student of Reihou Academy. She first debuted in Downtown Nekketsu Kōshinkyoku: Soreyuke Daiundōkai as the team's manager and cheerleader.
In Bikkuri Nekketsu Shin Kiroku! Harukanaru Kin Medal, Aihara's given name is used instead of her surname.