Inside a novel as the Hero’s useless brother

How to turn the most insignificant character in the story, described in just a couple of lines in the book, into the most interesting one?
It's extremely simple! Make him a nobody!
His older brother is the protagonist of the novel. As it is to be expected, an OP with a harem...
His twin sister is a powerful reincarnator, collecting all the cheat items around the world...
Even his wife is not only an incredible beauty, but also a hidden goddess...
What about the character himself?
Well...the author of this novel seems to have forgotten about him!
Talent? Superpowers? Attractive appearance... or maybe at least wealth?
None of that!
" Of all the possible cannon fodder, why did I move into this exact body? How am I supposed to survive?"
Follow Arthur Hayes on his arduous journey through the world of the novel, that he has read, as the useless brother of the main hero.