|This article is about a/an ally in Kamen Rider Amazon.|
Ritsuko Okamura (岡村 りつ子 Okamura Ritsuko): Masahiko's big sister and Professor Kōsaka's niece. At first she doesn't trust Amazon due to bringing Geddon to Japan and causing chaos. After being constantly rescued and helped by Amazon she puts her faith and trust in him.
Behind the scenes
Ritsuko Okamura was portrayed by Mariko Matsuoka (松岡 まりこ Matsuoka Mariko).
|GiGi Armlet - Condorer - Jungler - GaGa Armlet|
|Tōbei Tachibana - Masahiko Okamura - Ritsuko Okamura - Mole Beastman - Elder Bago - Professor Taro Kosaka|
|Ten-Faced Demon Gorgos - Red Followers|
|Spider Beastman - Vampire Bat Beastman - Mantis Beastman - Large Centipede Beastman - Mole Beastman - Porcupine Beastman - Snake Beastman - Crocodile Beastman - Crab Beastman - Black Cat Beastman - Snail Beastman - Ant Beastman - Dobsonfly Beastman|
|"Great Emperor Zero" - Ruler - Black Followers|
|Bee Beastman - Diving Beetle Beastman - Toad Beastman - Tiger Beetle Beastman - Owl Beastman - Mushroom Beastman - Sea Anemone Beastman - Japanese Dwarf Flying Squirrel Beastman - Salamander Beastman|
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