Definitely not. Genya remains outside the ranks of Hashira throughout the manga. This is because of a combination of factors such as his skills, experiences, and the overall direction of the story.
Well, the circumstances of Genya's death in the manga are quite complex. It involves a series of events and confrontations with powerful enemies. But I can't recall all the details at the moment.
There were a few novels that turned into demons at the beginning that could be recommended. Among them were " Revival of Evil Spirits: The Beginning of the Fusion with a World-Destroying Demon " and " The Beginning of the Transformation into a Demon ". These novels described how the main character became a demon under certain circumstances and gained great power. They are filled with decisive killing and dark elements. They might suit your interest. I hope these recommendations will meet your needs.
My knowledge doesn't have anything related to the main character becoming a demon king. Can you provide me with more relevant information so that I can better answer your questions?
I recommend The Tale of the Blood Crystal and The Ruthless Path of Magic. These novels told the story of the protagonist turning into a demon because of his family's destruction, just to take revenge. They belong to the category of fantasy novels. The plot is compact and interesting, and may meet your needs for the protagonist to become a demon of sorrow. I hope you like these recommendations!
One possibility could be that Percy, as a demon, struggles with his new identity. He might have to deal with new powers that are difficult to control. For example, he could accidentally harm his friends. He may also face discrimination from those who fear demons, even though he's still the same person deep down.
The plot could center around the mystery of how Ciel turned into a baby demon. There could be a search for a way to reverse it. His allies, like the Phantomhive servants, would be in a tizzy trying to keep him safe and figure out what happened. Ciel himself, despite being a baby, might still have some of his old memories and try to communicate in his own baby - like way, which could be really cute yet frustrating for those around him.