What is so "un-tanuki-like" about the name Kaisei?
Common given names in Japan have a certain format since probably the Showa period.

Old fashioned male names go something like "something-number-郎". Kinkaku and Kinkaku's actual names are 呉二郎 and 呉三郎 (Kunijirou and Kunisaburo).

Female names usually go something like "something-子" or "something-美".

Kaisei breaks from this traditional name sense, which is why her name is un-tanuki-like.