One Piece: No One Can Kill Me

Diniks was originally just a merman with a decent ability to recover.

But the experiments conducted on him by the scientist Caesar gave him immense strength and an unrivaled ability to heal.

With the potential to become the world's strongest creature and a special body capable of consuming multiple Devil Fruits, what kind of turmoil will this overwhelmingly powerful test subject unleash in the pirate world after escaping?

The Sea King?

No, the waves stirred up by the Sea King are too small.

The bigger the waves, the stronger the fish!

Only by becoming King of the World and having merfolk rule this ocean-filled world can he stir up waves that turn everything upside down.

[Reminder: The protagonist is not someone who transmigrated.]