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For context oh, My character Nova destroys their entire planet after being betrayed by their best friend. Their whole backstory dynamic is “Once a Great Hero, betrayed by their best friend, turned into a villain” . I want to know how to write a character who really doesn't care about the consequences, the morals, or anything in between. Nova knows about what they did; they know they've hurt so many people in the process of getting revenge, but simply doesn't care. They've been through enough pain that the death of thousands of people is meaningless to them. How do I write someone like that? What type of narrative / dialogue with said person have?
(For anyone wondering the Betrayal was their friend Lavender, who was like a sister to them, set them up in an arranged marriage for Alliance purposes and because that was Lavender's sister, who had a crush on Nova, but Nova fell in love with someone else. This pissed Lavender off, so she revoked Nova’s their position as high priestess and banished them from their coven; the coven that Nova built)