One Piece: Unreal Adventure - Chapter 66: And you never bleed?

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.

Jack Smith’s life ended rather abruptly. Spinning out on ice while driving a truck was not the most magnificent method to depart this earth. A mediocre man he had led an ordinary life until his death. Now with a second chance at life, he decided that this time he would be exceptional. This time he would finally live up to his name. After all, a jack of all trades is a master of none but ultimately better than one.Armed with a system and determination to do his best he sets out like any other reincarnated soul in another world to find his place and achieve great things. There is just one small problem with getting started in this endeavour . . . he is yet to be born!Welcome to a progression fantasy with a twist. What might you be able to achieve if your race to the top began before your body had even been born?Join our hero as he masters the language, magics and skills of the Compass Kingdoms but his first great challenge will be learning to walk once more. . . . .Warning 1: Be prepared for the MC to spend an entire book's worth of words and time as an infant but hopefully you will enjoy it nevertheless.Warning 2: Grandfather is legally abusive to MC for a couple of chapters but he is removed from that situation around chapter 30. To be edited out some time in the future.

The era of the great pirates.

The sea is surging, the strong are destroying the sky and the earth, and they are fighting each other. It really makes people——

Can’t get up!

I, Rusilu Cullo, twenty-four years old, my biggest dream:

Live this life safely!

- Description from novelbuddy

An orphaned boy with dreams of making it big through being a blacksmith is given a once in a lifetime chance to succeed when he's taken in by an odd pair - Eggor and Ella. While former teaches him the arts of craft, the latter teaches him the mysticism of cultivation, granting him two paths to tread in this life.