Dangerouskitty
[I just want to offer a suggestion. From my experience and knowledge] I hope you understand your character is not the body. Even if he were to inherit the memories or the body. There is a big difference between the person in control and the knowledge he has now learned. In my opinion, becoming a person does not mean you are them. Maybe I am just over analyzing, but let me set the example of a gamer playing a game. They know they are not the character, but they continue to exist in that narrative because they understand it's just a game. Then there are what I like to call it roles. It can be something as simple as a job you inherit by choosing that field of work. Now, you are no longer a civilian, but you have met the requirements and now you have a badge and a uniform. Society will call you a policeman. Now you are police on duty, but when you are not wearing the uniform. you are now the identity you have cultivated from birth. What you have experienced and lived through in this life is who you are without the role. Writers often can't distinguish the character between the original identity and the body which is now their original character's shell. The Role. The outside world will perceive him by Yahiko, but we know him as Dragon. I hope you don't make him someone who loves, because being alone without a relationship is very wise, but if there is a relationship. Your portrayal of love, Konan. She is a great weakness to someone who has lived such a life. I know about the experience of people who have killed the people they love, a brother, a friend and a family member. Either by an accident they had or the creed they have to abide by in that life. Love from my experience it’s taxing both physically and mentally as it's merely a role given to two people, but in a world of war. The comfort of another is calming, but that is a weakness dangerous people will exploit. Death will end love. I understand this is a fanfiction, but the general idea of romance is a great flaw. And if your character does not want to be weak. Then he should stay away from love and only when nothing can touch him or the people he decides to involve himself with will he be able to protect them from harmful events in such a world. My suggestion is for him to simply live out the life of a commoner, becoming a villain is a very childish ambition as it does not mean anything to anyone. The path of a villain is not filled with happiness, that I assure you. And if so those moments of happiness are extinguished very quickly.