Mamoru Tōdō (藤堂護, Tōdō Mamoru, とうどう まもる Tōdō Mamoru) is a fictional character and the Student Council President of Reihou Academy in the Kunio-kun series. He first appears in Downtown Nekketsu Kōshinkyoku: Soreyuke Daiundōkai, where he shows up during the opening intro. He is known for his huge dislike for Kunio and makes attempts to humiliate him in Downtown Nekketsu Kōshinkyoku, and Bikkuri Nekketsu Shin Kiroku! Harukanaru Kin Medal.
Tōdō is the final boss in Downtown Special: Kunio-kun no Jidaigeki da yo Zen'in Shūgō!, in the role of Asajirō.
Mamoru is a smug character who uses underhanded tactics and his wealth to get what he wants. Whenever his team loses in a sporting event to Kunio, he tends to react poorly as shown in Bikkuri Nekketsu Shin Kiroku. In fact, he goes out of his way to humiliate Kunio to the point of hiring people to do his dirty work and tell them lies, only for his attempts to end in failure. According to the ending of Crash 'n the Boys: Street Challenge, his obsession to bring Kunio down is the cause of his strained relationship with his father Kōnosuke.
- In Crash 'n the Boys: Street Challenge, Mamoru was renamed Theodore "Todd" Thornley IV. In this version of the game, he is made a playable character and acts as the captain of the Washington High School team. Washington High was Hanazono High School in the original game, so Todd replaces Riki.
- In River City Ransom EX, Mamoru is known as Titus.