One Piece: Starting at Impel Down to Rescue Fire Fist Ace

Lin Ze opens his eyes to find himself on Level Six, the Eternal Hell of Impel Down.

Just as he feels powerless to rescue Ace, a System mission to save him appears, granting Lin Ze the following abilities:

Roger's Conqueror's Haki, Hawkeye's number-one swordsmanship in the world, Shanks's Observation Haki Killer, Rayleigh's physical prowess and Armament Haki, Kaido's Conqueror's Haki coating, and Garp's Six Powers.

Lin Ze immediately chooses to form a four-man squad with Luffy, Crocodile, and Jinbe. Together with the Okama King and Buggy's group, they set off in force for Marineford to rescue Ace and Whitebeard.

Ace: Thanks for saving Luffy.

Phoenix: Is he Ace's friend? He sure is reliable.

Whitebeard: As expected of a newcomer of this era. There's no ship in the new age that can carry me anymore.

Kizaru: Oh dear, this is troublesome.

Aokiji: With someone this powerful around, I can't just sit back and take advantage of the chaos.

Akainu: Is he really even stronger than the Four Emperors?!

Sengoku: Garp, is he another one of your grandsons?

Garp: Hahaha! No wonder he's Luffy's friend.

The Pirate Empress: Darling, you're amazing.

Crocodile: If this kid joined my future guild, that'd be great.

Hawkeye: His slash is actually a few notches stronger than mine.

Kuma: ...

Doflamingo: How interesting. How interesting.

Moria: If I get his shadow, hehehe, I can become one of the Four Emperors.

Jinbe: I've never seen anyone so reliable.

Blackbeard: Zehahaha! Whoever you are, you can't stop me.

Luffy: Lin Ze, thanks for saving Ace.

Lin Ze: I'm just an ordinary person.