According to scripture Zi-bu-yu in Qing dynasty, Hua Po is a kind of tree spirit said to be formed from the disembodied souls of dead humans when three or more people hang themselves from the same tree. They appear as beautiful young girls that are dressed in white clothes but are much smaller than the average human. Although they cannot speak, it is said that they make sounds that are as beautiful as those of songbirds.
"A tree spirit of Chinese folklore who dwells in trees used for hangings. She is smaller than a human, and cannot speak, but her voice is said to be as clear as a bird`s song."
—Persona 3 FES Compendium
Hua Po is one of the exclusive Personae that have been introduced in Persona 3: FES. She can only be fused after obtaining the Small Cheongsam from taking Elizabeth to Paulownia Mall. Hua Po can also be fused by Aigis in the playable epilogue, The Answer, without this restriction.