Inside a novel as the Hero's useless brother[Progressive Fantasy]

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.