I really doubt Oda randomly put a monster from a movie amidst four Yokai.
Ju Peter Is likely some Yokai, but with a wider inspiration than the rest.
Ju Peter Is likely some Yokai, but with a wider inspiration than the rest.
Warcury's own boar form, the Fengxi, isn't Japanese either, but Chinese.
Oda is obviously working on a pattern here, having three Gorosei with Japanese inspirations, and two with outside Japan, though still Asian-based, ones. An inner circle & an outer one around IMU/Japan.
Either Garling will also have a non-Jap Yokai form, to make it 3 Jap & 3 non; or IMU himself will be based on a non-Japanese creature, to show him being a "foreigner" to the culture he's taken over & subjugated through the centuries.