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Rena Mamiya, also known as the Uca Worm, is an Executive Worm and a major antagonist in Kamen Rider Kabuto.


The original Rena was a compassionate singer who aspired to be in an opera. Its form was copied by Uca Worm, though Rena's kind-hearted personality still laid buried within. Rena was the one who initially spearheaded the Worm invasion until its originally personality resurfaced and realized it was a Worm, causing Rena to panic until getting comforted by Daisuke. However, Rena's original personality returning caused the other Worms to decide to eliminate it.

However, the Uca Worm eventually retook control and attempted to obtain the Hyper Zecter, only to be killed in an explosion from a hidden bomb inside the Hyper Zecter case.


Rena Mamiya

Uca Worm


           Kabuto logo.png Villains

Zecter Riders
Sou Yaguruma | Shun Kageyama | Tsurugi Kamishiro | Souji Kusakabe

Sails Worms
Executive Worms: Rena Mamiya | Reiji Nogi
Natives: Negishi | Masato Mishima
Minor Worms: Aracnea Worm Rubor | Aracnea Worm Flavus | Aracnea Worm Nigrita | Lanprys Worm | Bellcricetus Worm | Epilachna Worm | Pulex Worm | Verber Worm | Verber Worm Rota | Coleoptera Worm Aeneus | Coleoptera Worm Croceus | Coleoptera Worm Argentum | Musca Worm | Sectio Worm Acuere | Formicaalubus Worm Oculus | Formicaalubus Worm | Formicaalubus Worm Maxilla | Viellis Worm | Sepultura Worm | Tarantes Worm Purpura | Genomyas Worm | Brachypelma Worm Aurantium | Brachypelma Worm Viridis | Geophilid Worm | Acarina Worm | Acarina Worm Amber | Culex Worm | Cammarus Worm | Cochlea Worm | Leptophyes Worm | Subst Worm

Riku Kagami | Issei Kurosaki | Tetsuki Yamato | Next-Worms