Disney Infinity Fans

Albert Wesker (Capcom)
Deadpool ( Marvel)
Rapunzel (Disney)
Captain Jack Sparrow (Disney)

So the three guys could out do themselves in graziness and Rapunzel has those lovely 'thugs' to take good care of

Hmm...
Every Pixar character
Every Disney character
Felix BrownSLC
mutatedjellyfish
Adrian Ropp
altaireagle
Every other Avalanche employee
Walt Disney...

Mario & Luigi (Nintendo)
Rap Rat (Creepypasta)
Wreck-It Ralph (Disney)
Ender Wiggin (Ender's Game)
Donkey Kong (Nintendo)
Siren (Greek Mythology)

Rap Rat will traumatize the enemy with sadistic actions, and leave them to Mario and Luigi to finish them off.
If the enemy is immune to Rap Rat, then the Siren can distract them instead.
If both Rap Rat AND the Siren don't work, then Ender can divise a strategy that will utilize DK and Ralph.

I would put

Chewbacca(star wars)

Agent P(Phineas and Ferb)

Red(Pokemon)

Unicron(transformers)

Maxwell(Scribblenauts)

Um, if you had Unicron on your team, why would you need the others?

So they can watch in amuesment as unicron destroys everything in its path.

Deathstroke The Terminator (DC)
Cole McGrath (Infamous)
Vaas Montenegro (Far Cry 3)
Trevor Phillips (GTA V)
Salamence (Pokémon)
Tyreese Williams (The Walking Dead)
Hercules (Disney)
Go team physicality!

Wreck-It Ralph, Vanellope Von Schweetz, Fix-It Felix and Tamora Calhoun. ...Wait a second...

I couldn't limit myself to a dream TEAM, though... I'd need an entire dream army. I guess the "dream team" could be made up of everyone I put in a higher-up position, and I think that would go something like this:

Doug Walker(guy who knows everything), Nostalgia Critic(raw power and persistence), Mark from Classic Game Room(the guy everyone loves), WIR/Vanellope/Felix/Calhoun(ultimate team of four), Red from Godzilla NES(guy everyone fears but who we keep around because he can seriously screw over the enemy), Shigeru Miyamoto(the guy who doesn't go into battle but helps around the base, and because video games), Reggie Fils-Amie(because we need someone to be the "catchphrase guy"), Mario(because childhood), Spyro(because childhood), Crash Bandicoot(because childhood), Link(because he's Link), Village Mayor(Animal Crossing), Sprocket(because best Skylander, and I need a right-hand partner), Boomer(because Sprocket-Boomer OTP, and we need a crazy weapons guy), Greninja(Shiny, and because ninjas), Pit(because we need more characters who can fly), Flying Plastic Bag(because we need even more characters who can fly), and last... But not least...

Mann Co. Supply Crate #45 (because we need someone to lead us.)

Cole McGrath?
The guy who dies if he touches water?

In all seriousness, I never liked him anyway.
His moral compass was pointing in every direction but the right one, even if he makes the "good" decisions.
And how do lightning bolts constitute physical warfare?

I much prefer Alex Mercer.
At least from Game 1, I gave up trying to work out what the heck is going on in game 2.
My theory is that someone else is impersonating Alex Mercer and that's who you are actually fighting, not the real Mercer.
You want awesome physical combat, you can't beat a guy who turns his arms into blades or huge fists and shoot tentacles out of his body!