Reo Niiboshi

Age: 24

Birthday: 24 July

Blood type: B

A policeman who works in a kouban with Mabu, his partner and lover.

[Spoiler] He is a kappa who once served as a knight to Keppi, but now extracts the desires of humans on behalf of the Otter Empire after Otter resurrected Mabu. He wishes to use the Dishes of Hope to restore Mabu to his former self, who Reo believes is now merely a re-animated facsimile. In the spin-off manga, he is the adoptive father to Sara. [/Spoiler]

(Source: Wikipedia, Sarazanmai Wiki)