Here’s a fun game, so every Ultimate stage has special cameos in it, so pick 5 characters that would cameo in the stage of your most wanted, like for example
In a LBP stage, I would want the Garden King, Negetivitron, Toggle, Oddsock, and Swoop to cameo in it
For some of the stages I want to see in particular, multiple cameos wouldn't make a huge amount of sense.
For
Elenor Camuel, the stage I'd like to see them use is Falz Memoria; the meadow and successive Hellscape where you fight Dark Falz. I could see Dark Falz appearing as a stage hazard and a cameo himself, but the only other character you could really work in there would be Rico Tyrell, and then
because reasons you'd most likely lose Dark Falz and restrict the stage to the peaceful aesthetic. If you made Dark Falz a proper boss, you could get work her in, but eh...
If you went with Pioneer 2 as the stage, you could have a lot more cameos (Kireek, Ash Canaan, Dr. Montague, Alicia Baz, Tekkers, banker, nurse, etc.)... But the stage wouldn't be as powerful or dynamic, IMO. Granted I love the pioneer 2, but Falz Memoria just sticks with me so strongly.
For
Hildibrand (or another XIV rep if that's too outlandish), I'd actually like to see the Carteneau Flats as the stage during the Fall of Dalamud. While the GC leaders, and Gaius were there, they weren't on the frontlines. I guess you could have Derplander's party amongst the soldiers in the background, and you could certainly get Dalamud. If you make it something akin to the way the giants appear in Termina Bay, you could work in Louisoix coming in to ward of Bahamut and using the seal of 12 before failing and having the stage reset in a blinding flash of light.
Of course, you could just give XIV a dull stage too (Manderville Gold Saucer, Shiokaze Hostelry, Pillars of Ishgard, Limsa Lominsa Upper Decks, etc.) and get several cameos out of that, but is it really worth it? :-(
Then there's characters like
Giana where you'd be hard-pressed to get enough meaningful cameos no matter how you slice it. You could probably work out having the bosses from Twisted Dreams show up and maybe include some of the mooks as stage hazards, but that's basically it for characters. Technically Maria could show up, but I'm not even sure they want to commit to a design for her right now. >_>
Some others are... easier.
Reimu Hakurei - Hakurei Shrine (though I'd prefer Shining Needle Castle or Eientei): Marisa, Mima, Yukari, Genji, and Suika. Aya too for a 6th.
Sakura Shinguji - 'Tokyo' (I'm open. Castle, Ueno Park, in front of the Revue, whatever): Ogami and the rest of the Imperial Floral Assault Group.
Haruka Amami - 'Live Concert'. Pick an idol. Any idol. The 765 crew are the most likely, but any of them could be there. 346, 961, 315, etc...
and so on...