UNDYING (they/them) || WARLOCK (THE FIEND) CLERIC || SAGE || LAWFUL EVIL LAWFUL NEUTRAL || ZARIEL TIEFLING
Neglected all their life, and ultimately abandoned to die by their family, they were rescued by a powerful being. 'Chosen', by their 'god' - as they would come to understand it.
With a new chance at life, they will live it to the fullest. With the aid of their patron deity, they pulled themselves out of squalor. They are now healthy, live lavishly, and have all the resources and opportunity to learn everything they can get their hands on.
So when their god asks for favors, of course they will do whatever is asked of them - no matter how morally reprehensible it may seem. If the one being in all the planes who actually saw value in them, is asking them to do something, then it can't really be that bad; it must be for the best.