[Dr Kain]

Sort of off topic, but this covers a few of the creatures that were in KakuRanger and it kind of interesting to learn a bit more about the Youkai.

http://io9.com/14-terrifying-japanes...ium=socialflow

GashaDokuro (Junior, obviously), the Kamaitachi, Tsuchigumo, and Ittan-Momen were featured in Kaku.