One Piece: Marines from the Start, First Cut Off Red-Hair’s Arm!

[One Piece, Marine Vice Admiral, Zoro, Kuina, Empress, battles, invincible] Allen transmigrated into the world of One Piece with the power to control time and became the commander of an East Blue Marine Base. He named it Base 9525, and the first to arrive were the Four Emperors of the Red Hair Pirates.

Perhaps it was the will of Heaven in this world deliberately arranging things, but when Allen fought Shanks, he cut off Shanks's right arm. Everything fell into place. The events left unexplained or only briefly mentioned in the original story had changed because of Allen's arrival.

Next, the System issued its second mission: investigate the truth behind Kuina's death.

Arrest the mad scientist Su Bai, code-named Night of the Beheading.

He never expected to encounter another transmigrator or characters from other worlds here. Things had just gotten interesting.

After it was all over, Su Bai received an invitation from Marine Headquarters to serve as assistant instructor at the elite Marines training camp. The chief instructor was Zephyr, and the trainees included Sakazuki, Borsalino, Kuzan, and others.

Sounds good. You future Three Admirals, let's see how I train you!