Starting with a Logia Tremor Fruit: Rise to the Pinnacle of the Marines!

[Marine Protagonist][Natural-Disaster Justice][One Move Shakes the Heavens][Logia Tremor-Tremor Fruit][Whitebeard: "Where Can I Buy That Cheat?"][Quaking Justice][Pure One Piece Power System]

What if the Tremor-Tremor Fruit were a Logia?

What if the Marines had a "Whitebeard" of their own?

Then this sea would bow before a new kind of quaking justice!

Even if that justice... were itself a natural disaster!

--

Other people transmigrate into One Piece with foreknowledge, systems, and cheat abilities.

Gern transmigrates into One Piece and lands smack in the middle of Rocks's dark era! The plot? Already fed to the dogs!

A system? Doesn't exist!

His only option: join the Marines! Stay alive!

After four grueling years, he finally makes Seaman Apprentice, takes out a loan, and pulls strings to gamble his life on getting into the God Valley battlefield.

Yet before he can even reach the central area, Haki knocks him unconscious more than fifty times.

But when he opens his eyes for the last time, a mysterious fruit has somehow appeared in his arms. Gern steels himself and bites down without hesitation.

And the instant his teeth sink into the fruit...

Space shatters! The atmosphere wails!

His elemental body becomes the very source of the quakes. With a raise of his hand, the air trembles!

Logia-Type: Heavenquake Fruit!

Gern: "??? Aren't these familiar effects supposed to belong to a Paramecia? How the hell can this be a Logia too?!"

From that day on, Marine Headquarters gains its very own human-shaped natural disaster.

Gern's declaration of justice: "Everyone, stand back! It's time to enforce 'quaking justice'!"

Gern's motto upon becoming Fleet Admiral: "If justice needs a natural disaster to reshape it... then from this day forward,

my justice shall be that natural disaster!"