Keppi

Birthday: 1 January

A kappa who is the prince of the Kappa Kingdom. Very quick to irate, Keppi is easily irked and does not enjoy failure. He does take time to explain matters.

[Spoiler] Prior to the events of the series, the trauma of the Kappa Kingdom being defeated by the Otter Empire caused his shirikodama to split in two. The half containing his despair became Dark Keppi, a weapon of darkness controlled by the Otter Empire. Keppi maintained his other half, but was reduced to a chibi-style physical form, and was sealed in a statue in Kappabashi-dori before being awoken by Kazuki and Toi. [/Spoiler]

(Source: Wikipedia, Sarazanmai Wiki)