Hellper is so fucking amazing, in literally every aspect, from world to characters to plot. I don't even know how to begin this review other than to just tell you to read Hellper.
Starting with plot Hellper I think is damn near perfect, every scene and chapter feels so well crafted, and its pace is amazing, at no time in the series was I bored, every chapter had me hooked and the series is amazing at sprinkling in twists and comedy to break up the pace without halting it.
Character wise I think Hellper shines its brightest. Hellper doesn't have a lot of characters, but every single one is so uniquely designed and interesting that even those we only spend 3-4 chapters with have something that makes them fun to read.
Of course its world-building is also top-tier.Yes it doesn't compete with something like Tower of God or One Piece, but it still creates and interesting world that is both intriguing and interesting to learn about.