![Riou](https://img.flawlessfiles.com/_r/400x400/100/ca/2c/ca2c1565c75b8bd49be2673f7048a93a/ca2c1565c75b8bd49be2673f7048a93a.jpg)
Riou
リオウ
Riou, also called Leo in the manga translations, and Banikis Gigo (his partner) are the main antagonists of the first half of the Faudo Arc.
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Zatch Bell!
Supporting (Role) TV
![Yamamoto, Keiko](https://img.flawlessfiles.com/_r/100x100/100/ea/92/ea9216c3755f4b9ad4786f6b979e9186/ea9216c3755f4b9ad4786f6b979e9186.jpg)