One Piece: From the Start, I'm a Ghoul, and Zephyr Is My Father

[A growth story, forming a pirate crew, a big-family atmosphere, female Crocodile, a protagonist with a split personality who often goes berserk]

Reborn as the son of Marine Admiral Zephyr, he hasn't even had the chance to enjoy the happiness of a loving family before a long-planned conspiracy destroys it.

On the brink of death, he is abandoned by the System, which leaves behind only a System module.

He miraculously survives. Now, it's time for revenge!

He forms a pirate crew of his own. He's either getting stronger or on his way to becoming stronger.

He becomes a ghoul, unlocking the Ukaku, Koukaku, Rinkaku, Bikaku, and Kakuja, gradually earning new achievements.

He becomes a glutton of the seas, growing stronger by eating. He plunders racial traits, fruit abilities, and everything else, breaks through his own limits, and becomes the strongest all-around fighter.

The Five Elders: “What kind of monster are you?”

Drewen: “You call me a monster? No... I'm a demon.”

Imu: “You are not the one destined by fate.”

Drewen: “Now, what's 1,000 minus 7?”

[If the opening feels slow, you can skip ahead and start reading from Volume Two. You won't miss much. If that still doesn't work for you, start with Chapter 103, where the novel's biggest selling point begins.]