@ Wriggs
Aye...
I actually have something in mind for that puzzle that would utilize everyone....
It'll be sort of like this puzzle from LoZ: TP

But...with a lot more gimmicks
I'll sketch it out and see if my scanner is working, but it'll go like this:
- There will be 7 statues (the number of elemental stones Patchy has) which can only be activated by a constant stream of their particular element
- There will be a furnace which must be regulated (Annie) that will raise platforms and shift the room based on the amount of fire put into it (let's say there's 5 settings)
- The Statues will need to be moved onto switches after Patchy activates them (John)
- There will be walls that separate areas that can only be passed via certain means (John most likely could pass through most of them easily but everyone else would need help from Monado)
- The needed switches are invisible to the naked eye but each one can be sensed by certain means (Kenway, Renamon, and Nera)
Did I forget someone?
EDIT: Patchy has 7 elementals...
...ooooh boy...
EDIT2:
here's the starting layout

M' is moon
W' is Water
The goal is to get the letters (starting position of the statues) to their switches
...seems simple right?
Nope~ because the platforms aren't all on the same level.