Blackbird
Before Blackbird met the Warriors of The Winchester he was a slave traded on the oceans between Gramdirsk and Proudon. He was abused and mistreated until he escaped into The Republic in year Year 1489.
Blackbird was a very unintelligent Tengu that could not keep himself from eating everything he saw. After consuming multiple portions of flesh from undead encounters he contracted a disease that caused him to slowly turn into a ghoul. This process took many months but ultimately caused him to turn on his party members.
Blackbird was a member of Warriors of The Winchester for a few months before he attacked ship mates under contract with The Republic. He was jailed in Steelport for attacking the crew on the <ship name here>. While in the prison he infected other prisoners with the ghoul disease he had contracted. This caused a quarantine of the prison. The Warriors of The Winchester took a contract to cleanse the jail of the undead filth and ultimately killed blackbird in the end.