@Berry:

Vegapunk's Emerald City Arc would be a great time for a new crewmate.

I want Steam Punk/Nikola Tesla themed arc about Vegapunk

A while ago I decided that the reason why Laugh Tale is so hard to find is because it's submerged under the sea most of the time. Only once the moons and planets are align the right way the gravity causes tides and the island emerges from the ocean. That's why there are 4 Poneglyphs, 3 for space and 1 for time, so that you know where to come and when to come.
Once it emerges out of the ocean, the Island functions as a teleportation station, which launches you strait to the Moon on a light beam.
So Luffy will become the PK, and disappear for 4 years, and then come back and start a war against the WG. While on the Moon they will learn all they need to know, and Nami will see the entire planet, so creating the world map will be easy.

Franky

• sea stone Brass knuckles
  -nuclear bomb (like the one he detonated, just more powerful)
  -and eventually he'll turn the entire Sunny into Mecha transformer.

Brook
-some haki

• he'll be able to possess people if he overpowers their will power, and control their bodies

Robin

• armament haki, and she'll be able to manifest her hands inside other people and attack their organs directly.

Chopper
-He'll be able to use moves like arm pointo, defense pointo and jump pointo while in monster point.

Usopp

• he'll perfect his observation haki
• he'll use sea stone pikado darts to hit paralyzing pressure point of his opponents, from insane distance.
• his Kabuto will eat the DF, which will allow it to store anything insade of it, and spit it out when needed.

Nami
Nami will perfect her illusions
Will be able to produce island busting lightnings
And she'll be able to control the weather on the scale of a large county.

@Zik:

Then Enel attacks.

I don't think he'll attack right away, but it will bring him back into the story.
Maybe he became a good guy up there, found people he loved, and now they have all been killed.

Within the next few chapters Nami will use he weather manipulation powers to clear the sky, and as the moon becomes visible once again, the Mink tribe will rise and raise the havoc.

Then Kaido destroys the Moon.

It is possible that BB will attack BM territory, and she'll have to run back in the middle of the fight.

@JohnTnaig:

Why are you named after an Australian insecticide?

Roughly 15-16 years ago I was playing some game in a pc gaming place, and I named myself Mortein so that when I got several kills in a row I would write Multi Insect Killer.
Which would look like this:
Mortein: Multi Insect Killer
Which was also what they would say on the commercial for Mortein on the TV back then.
So I liked the name and decided to keep it.

The moon is still not destroyed?
Ok, I'll come back later.

Luffy defeats BB, becomes PK, starts the war with the WG together with Sabo, who at this point will be the leader of the revolutionary army.
In the end Luffy and Coby will first fight eachother, and then together defeat Im.

@arkur:

It doesn't work that way, her Vivre Card still says she's 30. No-one ages outside of timeskips or on-panel birthdays (basically like The Sims where the act of eating a birthday cake ages you up).

I don't like that