Hakua (白亜) is a character that has yet to formally appear in any series. Little is known about her.
Hakua has raceless white skin, long white hair and lifeless dark gray eyes. Some of her hair is held by a dark gray ribbon. She wears a pale gray dress, with boots that have dark gray bows at the side. A long white petticoat with a buttoned turtleneck can be seen underneath the dress. She wears a dark gray bow right beneath the turtleneck. She also holds a malicious, monstrous scythe.
Not much is known about her personality.
Not much is known about her past.
Up to this day, Hakua has only appeared in some of Deep-Sea Prisoner's Illustrations.
It was revealed on a live stream that Sirius is Hakua's ex. Sirius had a reputation for being loose with many girls, thus leading to Hakua - among many others - to hate him. 
- "Hakua" means "white rank/follow white".
There are currently no known quotes from Hakua.