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Mari Nikaidou (二階堂マリ)Classification: Earthling
First Appearance: Manga Chapter 6, Anime Episode 3, Kinnikuman II: Anime Episode 17
Mari Nikaidou is a teacher at Suminoe Kindergarten that falls for Kinnikuman. When Bibinba arrives, she feels overshadowed by her and gives up on Kinnikuman, going overseas to study. In Kinnikuman II, Mari has returned to Japan and has an adopted daughter named Rinko who is the love interest of Kinniku Mantaro.