Hai

Hai is an eldritch horror which is thought to be a demon from rural Seramika who seeks to avenge the mysterious homicide of his village. In truth no one truly knows exactly who - or even what - Hai actually is; he employs masterful illusion magic which conceals his form making him simply as a figure in a black robe wearing a white mask with blue eye-shaped runes. What is known is that he currently travels the world aboard the Underworld committing vigilantism against corrupt guards and politicians.

Hai's Story
Hai claims to be a tiefling born around the time that civilised society in Seramika declared demons to be monsters, and spent most of his childhood living in a hidden ghetto whose occupants practiced illusion magic in an attempt to avoid persecution at the hands of the local authorities. While this worked for over a decade, eventually a mysterious religious organisation, who Hai (and supposedly the rest of the community) had never heard of, caught up with them and burned the area they inhabited to the ground, killing all of its inhabitants.

Except for Hai, who was so gifted with illusion that he managed to escape without notice, but not quite skilled enough to assist his family and friends. He then travelled away and lived alone in hiding for years, trying desperately to remain anonymous, knowing virtually anyone could tip off his mysterious pursuers. Over the years he forged a new identity for himself, and decided he would take revenge against his community’s killers. He left his seclusion, dubbed himself  ‘Hai’ - for unknown reasons, cloaked himself in magic - as well as his minimalist signature outfit consisting only of a cloak and mask and set off for vengeance.

But his mystery targets proved exceptionally difficult to track. No survey of his homeland revealed any leads, but he did manage to find work as a mercenary and eventually made enough money to pay for the service of the demon-pirate Fellbeard, who lends his ship and his skills to Hai. The content of this paragraph is the only part which is known to be true.