One Piece: Starting with God Valley, intercepting the Dark-Dark Fruit

Tags: Anime derivative, Time travel, 2D, One Piece, Starting point, Fan fiction, One Piece
Main character: Giger
Synopsis: (No system + multiple Devil Fruits + decisive in killing + Marine Admiral + Celestial Dragon)
Gigg, from Earth, transmigrated to the world of One Piece and began his journey as prey for the Celestial Dragons in God Valley.
Without a system, without a cheat code, and without any grandpa, the only way Gigg could think of to break the deadlock was to find the top-grade Devil Fruit hidden in God Valley!
However, he, who had originally set his sights on the Paw Paw Fruit, actually discovered the Dark Dark Fruit!
Just as he was contemplating slaughtering all the Celestial Dragons in the future, Korin, the captain of the Knights of God, suddenly appeared before him and told him...
Your background is quite unusual...
An experimental body, a powerful background, and the most ferocious Logia-type Devil Fruit, the Dark-Dark Fruit...
"Universal Guidance!"
"Shinra Tensei!"
"Planetary Devastation!"
"Divine power!"
Having mastered the Dark-Dark Fruit to its fullest potential, Gigg, a Marine Admiral and concurrently the leader of the Knights of God, sets his sights on the Five Elders.
"Excuse me, but I am legally judging a Celestial Dragon."