Shmoo here

You can have the request added to your reservation. As I noted, it's not guaranteed, but DCL does try to accommodate such requests. Just give DCL a call and have them add the request.

The only "dress code" DCL has is "no swimwear in the main dining rooms at dinner, please" (well, except for Remy/Palo, they have a higher level of dress required). Beyond that, you'll see all manner of dress at dinner, from cutoffs/t-shirts to full formal wear. Do what works for you. You can have the request to be seated alone added to your reservation, but it's not guaranteed. At late seating it seems to be more often granted. Or, if you book Concierge, the default is to have a separate table for only your party.

I believe that's "Palo". Also, "Palo" on the Wish, but is a steakhouse instead of the other ship's Italian theming.

Basically, each dining room has it's own Signature menu, that's served once during the cruise. The other 4 nights the same menu is offered in all dining rooms. That is 4 different menus, but the same one on the same night in all dining rooms. You will have 7 different menus over the course of the 7 nights.

I would be surprised if it was offered on less than 6 night sailings. Since it's typically the second time you dine in Animator's and a 5 night sailing has 1/3 of the guests who don't dine in there twice.

Most DCL cruises have a pirate night, except for the Alaska cruises. And, maybe, any Baltic cruises (if they're still doing them). Marvel cruises, I believe, are only on specific cruises, like the Star Wars cruises.

They do when you order a soda in the bars, and for room service.

Los Angeles, CA to Barcelona, Spain for an ocean cruise Los Angeles, CA to Bucharest, Romania for a river cruise.

Yes, you can bring soda onboard. At least you used to, don't know if COVID killed that option. You could bring whatever non-alcoholic beverages onboard then. You may be assigned to a table with others, depending on your party size. Unless you're concierge, then the default is to give you your own table. You can make a request (not guaranteed) for your own table, if that's what you want (or, conversely, request to be seated with others if you're concierge).