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Tōdō (藤堂, とうどう Tōdō), full name Tōdō Mamoru (藤堂護, とうどう まもる Tōdō Mamoru) the Student Council President of Reihou Academy and a 3rd year student in the Kunio-kun franchise. He is one of the main antagonists of the Downtown Nekketsu series and first appears in Downtown Nekketsu Kōshinkyoku: Soreyuke Daiundōkai, where he shows up during the opening intro. He is known for his huge dislike of delinquents, especially Kunio of Nekketsu High School, and makes multiple attempts to humiliate and defeat him in the series.
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.