A classmate of Toshihiko Tanaka, Keigo Mahori joined the Kakegawa High School soccer club after Yoshiharu Kubo's death. A returnee from Brazil, he is a technical player who specializes in South American-style trick plays. When he first joins the club, he has a dispute with the club members who are still bewildered by Kubo's death, but they reconcile through an intrasquad game arranged by Atsushi Kamiya. After that, he blended in with the team with his natural cheerfulness and continued to play an important role in covering Kubo's midfielder position.

田仲俊彦の同級生で、久保嘉晴の死後、掛川高校サッカー部に入部した。ブラジルからの帰国子女で、南米仕込みのトリックプレイを得意とするテクニシャン。入部当初は久保の死に囚われ続けた部員たちと揉めていたが、神谷篤司が仕組んだ紅白戦により和解する。その後は持ち前の陽気さでチームに溶け込み、久保のポジション(ミッドフィールダー)を埋める重要な役割を果たし続けた。