Ones you have used, ones you are using, or ones you just have.
Human "Barbarian" Paladin of Bahamut:
Basically saw a dragon once and become obsessed with how strong they were and fell assbackwards into worshiping Bahamut.
Elderly Tiefling Wizard:
Up for anything, basically doesn't give a shit anymore, just wants to do illusion magic and parlour tricks and maybe help a few people if they can.
AMAB Enby Devil-Cleric:
Self-serving, sugardaddy is Asmodeus, or some other devil, they made a pact with in exchange for hrt and magic powers.
based
I'd imagine he'd grow as a character and learn to let go of revenge and become involved with the struggle of the common people while living his new life as a professional adventurer/mercenary. His arc would be complete when he fights in a successful peasant uprising to overthrow the monarchy.