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.
There was a recommended novel about transmigrating cells and cultivating immortality called "Cell Cultivation". This novel was a Xianxia/Cultivation novel, which included transmigration, prehistoric, interstellar, and technological cultivation elements. You can read this novel on Qidian Chinese website. The author is China's Jiao Zi, Giant Panda.