Knowing Oda, those might be quite close to right : D And they are very nice indeed.

Did he ever say that we're going to see Fishman Karate Dojo? I only remember this one SBS where he was asked about where it's possible to learn Fishman Karate and Oda said that in Fishman Island, but didn't say anything about dojo or that we'd see it.

Tom's brother (Den was it?) Is the next companion. He hid himself in the ship Robin style, and that's why he wasn't there to say good bye in the latest chapter.

Back in the tenth anniversary of One Piece, there was some talk about guy in eye-patch who would appear later on One Piece, but I don't remember anything else about it… Could someone lighten me up about it?

Cobra dies, and when Vivi becomes the queen, she'll give her crown to Cooza, and joins to the Straw Hat -crew

How about this kind of scenario:

Fishman Island becomes officially part of the World Government and capturing and slaving fishmen and mermen will be made illegal. Those who used to be slaves are also freed, including Jimbei's crew that has mostly slave members. Jimbei has still bounty on his head, so he still can't stay at the Fishman Island and therefore has no other place to stay than the Straw Hat -crew?

Umm… Where do all these theories of fishmen being born from mermen and humans come from?

Those Okama twins are crewmates of Big Mam

Toriko is the next nakama

Is there any colorings of the princes or ministers?