One common theme is the struggle between good and evil within their relationship. Since Jack has the Jekyll and Hyde aspect, it often plays into how he interacts with Henry.
One great place to find 'Jeckyll and Hyde Jack x Henry fanfiction' is Archive of Our Own. They have a wide variety of works that explore different aspects of their relationship.
There's no way to know just from 'Henry Henry novel' whether he is the protagonist. It could be that he is just a minor character or part of a sub - plot.
I'm not sure which specific 'Henry Henry' in a novel you are referring to. There could be many characters named Henry in various novels. Maybe it's a relatively unknown or self - published work. Without more context, it's difficult to determine who this 'Henry Henry' is.
Henry in the 'Haunted by Henry' true story could be a historical figure. He could have been a soldier who died in a battle near a certain place and now haunts it. Or he could be a local hermit who had a strange reputation during his life and after his death, people started experiencing strange things and attributed them to his haunting. Without more details, it's difficult to determine exactly who Henry is, but he is clearly the central figure in this supposed true haunting story.
In 'the john henry story', John Henry was a heroic figure. He was a railroad worker who was known for his amazing physical strength and his unyielding spirit. He became a symbol of human resistance against the rise of machinery in the workplace.
Blowing hair would cause damage to the hair that had already grown out, resulting in damage to the hair quality, dryness, and other problems, but it would not affect the newly grown hair. After the hair is rinsed, it is recommended to pay attention to your living habits, strengthen your exercise, avoid staying up late, eat more fresh green vegetables and fruits, and promote better hair growth. As for whether the new hair would grow better, there was no clear answer in the information given so far.
In the 'Henry Sugar True Story', Henry Sugar is presumably the protagonist. He could be from any walk of life. He might be a working - class man who had a series of unexpected events occur to him. It's possible that he had a great passion for something, like art or music, and his story could be about how this passion led him on different paths in his life. Or he could be a bit of an enigma, with the story gradually revealing more about who he really is as it progresses.