Daki and Gyutaro
I remember when those two were still mortals. There used to be an unremarkable city with a famous temple to Lathander, the god of the dawn. Though he speaks of goodness and self perfection, this city held one of the largest red-light districts in the mortal realm.
Within the city, there were two siblings living a life of poverty. With no family or orphanage to help, they took the streets and stole to survive. Occasionally, they would pray to Lanthander's symbol for good health and youth. These prayers remained unanswered.
Even without help from the divine or mortals, these two survived their harsh environment and made something of themselves. The girl became an aspiring courtesan while the boy became her bodyguard and collector. They were bettering themselves like Lathander teached and yet their prayers continued to be unanswered and others shunned the boy for his poverty and ugliness.
Eventually, a samurai in the brothel the girl worked at became upset with her attitude for not agreeing to lay with him. After defending herself, she was burned almost to death. After fighting and killing the samurai in revenge, the boy carried the girl through the streets begging for help. No one answered.
The boy carried the girl to Lanthander's church where the doors were locked and the boy was shunned. He begged Lanthander to help him now. He just wanted his sister to live. Lathander had done nothing for him his whole life despite the prayers but this would make up for all of it. Lathander did not answer.
After a long silence, the boy began to curse Lathander and his so called good city. No one had ever helped them and had only gotten in their way. He regarded everyone as trash in that city and that all their lives combined would not be worth as much as his sister's. From the bottom of his heart, he wished he could save his sister and destroy them all.
As the boy passed out from his wounds gained from combat, he heard a voice. "Very Well" I said. As the night sky lit up with flames and demons flew overhead and swarmed the streets, I stepped out of my abyssal gate. "Your attitude pleases me. For your sister's life, you and her will serve me and start by culling this city." The boy smiled as he fealt the demonic power rush into him. He asked "What is your name my lord?" I said "You may call me Grazz't."