Piwi is a round pure green fluffy bird-like creature. He actually is a Moss of World Tree, Yggdrasil. Piwi is raucous and very ignorant. Yet, he has been described with a "cute" personality. He is very carefree, sometimes even oblivious to the violence that occurs around him. Piwi is considerate of others. (Source: Helck Wikia)