Something very important to the story.

So I am looking for the origin of MC. but I can't decide on what it should be.

Origin is the starting point that defines one's existence and directs one's actions throughout life. It is the driving force that comes from within the world that has managed to stream out of the Source and take on material form. The form it can take on at times is that of a human being, and all humans match their actions to be in harmony with the driving force that originated them from the moment they enter into the world.

These actions are more along the lines of an inherent compulsion that could be called a person's instinct rather than a conscious decision. If a person becomes awakened to their Origin, it becomes nearly impossible to stray from their Origin if it's even possible in the first place. It becomes an impulsive behavior one would follow as though it were an absolute order. The Ryougi Family can awaken the Origin of newborns, and Souren Araya is capable of awakening one to their Origin after receiving consent from the person beforehand. Araya claims that death and Origins are related, and his various experiments on death are used to further his knowledge of them.

So I am looking for the 'origin' of MC.

And shouldn't be about death or things like that it's something that came from him rather than what he got after he was transported to another world. Something that is deeper and has a lot of potential.

So if you have any ideas feel free to comment.