Rebirth in One Piece as Deputy Captain - Chapter 15

Kael Veyne was betrayed, hunted, and left for dead in the depths of the Abyssal Dungeon.As an infamous assassin, he was the empire’s deadliest shadow—until the day his guild turned on him.Ambushed in the Abyssal Dungeon, his body was torn apart, and his soul was consumed by the abyss. But death was not the end.He reincarnates 25,000 years later with the Devouring Bloodline System. Kael awakens in the body of a noble scion sharing a similar name to him, and his very essence fused with eldritch power.With every kill, he absorbs primal energy, evolving into something far beyond human. Monsters, mages, mancers, knights, assassins—nothing is beyond his reach.

Lin Yu traveled to the world of royal beasts, obtained the collection book of God’s pet beasts, and contracted fallen angels at the beginning.

And obtained the talent of devouring, which can make pet beasts devour and evolve infinitely.

Everyone looked at the fallen angel with twelve wings and a height of 1,000 meters filled with darkness, dumbfounded.

“Can you tell us where all your beasts are contracted?”

“My friend gave it, and I picked it up.”

“Isn’t this figure too big?”

“Maybe she ate a little too much?” Lin Yu scratched his head embarrassedly.

- Description from novelbuddy

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.

Jian Tian transmigrated into a Mary Sue school novel and became the cannon fodder female supporting character.Although she is cannon fodder, her entire family is full of villains.The villainous eldest brother opposes the male lead and leads the company to bankruptcy.The villainous second brother opposes the female lead and ends up with crippled legs.The villainous third brother is a love-struck fool and ends up on the streets.And she has it worse, being implicated and sent to prison.Why should she be the only cannon fodder in a family of villains? She wants to turn the tables! She wants to rise!However, just as she ignites her fighting spirit, she discovers she’s bound to a system that will obliterate her soul if she doesn't slack off.Jian Tian: “...”Lies down.And she even persuades her whole family to slack off collectively.Seeing the eldest brother working overtime at the company: “Stop working overtime; after all, the company won't be yours in the end! Trust me, first lose 1 billion!”Seeing the second brother busy with his medical career: “Don't work too hard, after all, you're ultimately making wedding dresses for others. Why not research a cure for crippled legs instead?”Seeing the third brother running errands for the female lead: “Isn't being a happy bachelor nice? Why must you suffer for love? Wake up, licking the boots will get you nothing in the end!”The three brothers of the Ji family: “...”Has our little sister gone crazy?Later, after experiencing the joy of slacking, the three brothers: “Hmm, this is nice...”However...We agreed to slack off together, so how did you quietly become a top boss?!Jian Tian awkwardly scratches her head: “There’s too much development in my field; I can't help it.”And the dark villain lurking in the shadows, aggressively wrapping his arms around her waist: “Hmm? How about including me too?”Jian Tian: “...”Don’t come near me!