Return of the Calamity-Class Death Knight - Chapter 219

Three Emperors have died in quick succession. The prince whom nobody had taken notice of unexpectedly succeeds to the throne. He is quickly plunged into layers upon layers of danger. The Empress Dowager dislikes him, wishing to install a younger, more obedient Emperor. His half-brother dislikes him, accusing him of stealing the throne that is rightfully his. The palace attendants and servants dislike him, believing that he is not a true Emperor. The Child Emperor must save himself.

The year was 2026, and the world wasn't what it used to be. Ever since the Abyss Gates cracked open three years ago, spilling monsters and dungeons across the planet, life had turned into a chaotic mess. Cities were half-ruined, half-rebuilt, and people clung to whatever normalcy they could find. Hunters—those brave or crazy enough to fight the monsters—became the new heroes. Everyone else? Well, they just tried to survive.Fin wasn't a Hunter. He wasn't a hero either.He was just… Fin. A lanky 19-year-old with messy brown hair, a chipped front tooth from a dumb skateboard accident, and a power that everyone called useless. Absorption. Sounds cool, right? Like he could suck up energy or steal someone's strength. Nope. All it did was let him “feel” things he touched a little more than normal. He could tell you the exact texture of a brick wall or how warm a coffee mug was—big whoop. No fireballs, no super strength, no flashy moves. Just a glorified touchy-feely trick.“Fin, you gonna eat that sandwich or just stare at it like it's gonna confess its life story?” Meg's voice snapped him out of his thoughts.He blinked and looked across the rickety table at his best friend. Meg was short, loud, and had a wild mop of dyed purple hair that she swore made her look “intimidating.” It didn't.

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

A human from Earth is thrust into the [Hunter x Hunter] world, becoming the Zoldyck family’s defiant, red-eyed prodigy. They call me a genius and the rightful heir, but I say that’s Killua’s burden to bear.Armed with crimson eyes, and a subtle yet powerful system, I’ll rewrite destiny, upend the world, and embrace the chaos with a wicked grin.