What would be your dreamlist of playable characters?

Perhaps "matched" characters like buckmana suggested can have their own mashup play set with puzzles akin to Four Swords.

WAVE 1
All confirmed characters (as of 23/5/13)
Wreck-it Ralph
Vanellope
Fix-it Felix
Calhorn
King Candy
Lone Ranger
Tornto

WAVE 2
Gravity Falls - Dipper, Mabel, Soos, Stan, Wendy, Gideon
Avengers - Iron Man, Thor, Captain America,
Toy Story - Woody, Buzz, Rex, Jessie, Hamm, Green Aliens, Ken, Barbie
Star Wars - Darth Vader, Luke, Leia, Han, Wookie, Boba Fett
Up - Carl, Russell, Dug, Kevin

FUTURE WAVES
Guardians of The Galaxy - Star-Lord, Rocket Raccoon
Big Hero 6 - TBA
Incredibles - Frozone, Jack-Jack
Tangled - Flynn, Rapunzel, Maximus, Pascal, Mother Gothel
Mulan - Musshu, Mulan
Beauty and The Beast - Beast, Lumimere, Mrs.Potts, Cogsworth, Belle, Gaston
Cars - Flynn McMissile
Brave - Merida, King Ferus
Lilo and Stitch - Stitch, Jumbaa, Pleakly, Leory, Rebuen, Sparky, Hamsterveil, Gantu
Wreck-it Ralph - ALL THE SUGAR RUSH RACERS!
Tarzan - Tarzan, Jane, Professor Porter
Kim Possible - Drakken, Kim, Ron, Sheigo
MORE TO BE ADDED

As far as Yin and Yang were concerned, they did use their powers together.

Yang fired lava at his targets, then Yang would spray water on the lava, causing it to rapidly cool and become solid, immobilizing whatever was inside it.

However, as you can imagine, being covered in molten lava is not exactly a pleasant experience!

Bonnie and Clyde worked differently, Bonnie was a planner, but Clyde had the skills.
Essentially, brains and brawn.
They were professional thieves, by the way.
Although Bonnie did have some skills of her own, she is fast and agile, also a talented pickpocket.

Other than those already confirmed: Frozone, Hulk, Iron Man, Darth Vader, Chewbacca, Mulan, Ariel, Aladdin, Beast, Jafar, Peter Pan, Captain Hook, Smee, Alice, Stitch, Jumbaa, Tarzan, Terk, Winnie The Pooh, Tigger, Ursula, Silver (Treasure Planet), Mickey, Donald, Goofy, Pete, Hercules, Hades, Phil, Queen Of Hearts, Pinocchio, Robin Hood, Little John, Sheriff Of Nottingham, Simba, Timon riding Pumbaa, Scar, Mowgli, Baloo, Bagheera and Shere Khan

This is what I want now.
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1. Iron Man

2.Thor

3. Anakin Skywalker

4.All of the main characters from the original Star wars trillogy (Luke Skywalker, Han Solo, Princess Leia and Chewbacca)

5.Darth Vader and Boba Fett

6.Yoda

7.Obi Wan Kenobi

8.Loki

9.Darth Maul

10.The Incredible Hulk

11.Rex

12.Frozone

13.Calhoun

14.Rocket Raccoon

15.Dr. Doofenshmirtz

16.Timon

17.Pumbaa

18.Star-Killer

19.Spider-Man

20.Anybody who's Apart of SHIELD that only Appears in the Cinematic Universe movies.

21.Thanos

22.Mickey

23.Goofy

24.Donald

25.Pete

26.Mr Potato Head

27.Hercules

28.Maleficent(Sounds cool, but don't know if its going to happen)

29.Scroop(Could Happen)

30.Fix-It Felix Jr

31.Huey

32.Dewey

33.Louie

1. woody

2. everyone

I'm not going to list to many ones I've seen listed already but I would love to see:
Lilo and Stitch (pretty much everyone) and a power disc of the Bigwheel!
The Weasels from Roger Rabbit
Roger, Jessica, Benny the Cab and a power disc of the Hammer
The Hitchhiking Ghosts, the Bride <-- Haunted Mansion playset anyone?
Merlin from the Sword and the Stone
Dopey, Grumpy, ect
Oswald
I stuck with Disney/Pixar but I'd love to see Star Wars, Marvel, Disney XD

My list is a lilo and stitch play set : stitch, lilo, jumba and pleakly. Another is the avengers play set it comes with all the avengers and the last is Mickey Mouse vintage

^Nice suggestions!
Welcome to the fourms, by the way.