Gear Ideas

Luffy:

Fourth Gear: Inflates arm. Stretches pores in arms to release air like a deflating balloon, propelling the punch. Attacks would include the prefix 'Puffing' in reference to the Puffing Tom steam strain.

Fifth Gear: Super-heats his body to become liquid rubber.

Sixth Gear: Crafts his liquid limbs into weapons.

Buggy:

Second Gear: Splits into tiny, nearly-microscopic particles.

Third Gear: The end of his finger opens up like a hatch and fires a Super Muggy Ball.

Luffy Attack Ideas

Gum-Gum Shotgun: Pulls back his arms like bazooka, and coats his fingers with Armament Haki. Hits the enemy with his fingers, not knuckles.

Gum-Gum Cannon: Wraps both arms together, like with Giant Hammer, pulls back and shoots them forward, hitting with two fists and spinning them.

Gum-Gum Battle-hammer: Puts his hands together and throws them up in the air like with Battle-axe, then brings them down.

Gum-Gum Gong: Bell, but twists his neck around, similar to the rifle. Gets dizzy afterwards.

Gum-Gum Meteor: Grabs enemy and extends his arm as high as possible into the air, then slams them into the ground.

Gum-Gum Drill: Wraps both legs together, then hits the enemy with his heels and spins them.

Gum-Gum Dagger: Uses tongue to pull front tooth back, then snaps it forward. His entire body is rubber, so I figure his teeth are, too.

Gum-Gum Cymbal: Shoots both arms out to his sides and brings them together to converge on someones head.

Gum-Gum Sanji: Stands on his hands and spins, twisting his legs so they look like a lollipop, then releasing, causing them to whip out. Named after Sanji's signature technique where he spins around while standing on his hands.

Gum-Gum Treasure Chest: Stretches his jaw and bites down on someone.

Gum-Gum One Piece: Gear Thirds head and uses Treasure Chest.

AU Pirate Crews:

-Lead Pipe Pirates:

Luffy

Ace

Sabo

-Impel Down Pirates:

Luffy (Captain)

Jinbe (First Mate)

Mr. 3 (Navigator)

Buggy

Crocodile

Daz Bones

-Buddha Pirates: Pirates and Navy switch roles.

Sengoku (Captain)

Garp (First Mate)

The Rest of the Navy

-Fairy Vearth Pirates: Enel returns with his robot army from the moon.

Enel (Captain)

Robots (Subordinates)

AU Arcs

Edward Newgate Jr.

Instead of Ace dying, it's Marco who dies protecting Luffy. Blackbeard steals Whitebeard's fruit, but the Whitebeard pirates and the Navy briefly work together to take down him and his crew. Ace used Kuma's power to his advantage to send Luffy away to make sure he didn't get hurt in the ensuing fight. Immediately after the fight, Marineford is barely even passable as an island anymore. Akainu carries on with the execution of Ace, grabbing him by the face and scorching him. A burn mark that looks similar to Whitebeard's mustache is left on his face. The 3 admirals wipe out a majority of the Whitebeard pirates, and Ace is powerless to stop them. Marco briefly returns to life to carry Ace to his boat and uses his remaining energy to pour fire into the engine, launching Ace far off. Ace, distraught at the loss of his friends becomes an extreme revolutionary under the name Edward Newgate Jr. Luffy still thinks he died in the fight with Blackbeard.