Author's Name: Your_Only_Goddess

Character's Name: Yuuko

Book of Character's Origin: (Yet to be published)

Genre: Fantasy (Dark)

Help: Yuuko is just a normal boy with a normal life but in the end, he becomes someone completely different. I would like to know how I can make my innocent character develop into someone completely different through pain. My book is not going to be something like an awkward, shy girl developing into a hot, popular babe but is basically similar to Kaneki Ken. I apologise for this long paragraph but please help.