The game touts being able to unlock over 20 well-known characters. I'm advanced along enough that I know some of them so I'll try not to spoil what's coming next. Most of these are no-brainers. It was kind of shocking that Janice and Teeth were missing at the beginning. They will probably come later so I'll list them as such.
So far, it seems the characters included are:
- Kermit
- Fozzie
- Miss Piggy
- Gonzo
- Rowlf
- Animal
- Floyd
- Sam
- Mahna Mahna
- Snowth(s)
- Swedish Chef (acknowledged in Kitchen level)
- Beaker (shown in advertisements)
- Bunsen (shown in advertisements)
- Dr. Teeth (is bound to eventually come)
- Janice (is bound to eventually come)
- Rizzo (is bound to eventually come)
- Walter (is a likely inclusion these days)
- Pepe (is a likely inclusion these days)
So, there's three more to make it "over 20." I think they might have a Pigs in Space level, so Link and Strangepork would fill out two of the slots. Lew, Sweetums, Suggs, Harry, Beauregard or Robin could easily pop up. I wouldn't hold out for Clifford, Sal or Johnny Fiamma. Hmmm...
Non-"well-known" characters:
- Muppet Rats
- Muppet Chickens
- Muppet Veggies
- Muppet Penguins
Non-traditional/game-created characters:
- Big Mo
- Durwood Clapper
- Jax Strumley
- The Divettes
- Kizzy
Non-locked characters:
- Scooter (appears as a greeter)
- Statler (appears in the balcony scenery)
- Waldorf (appears in the balcony scenery)
- Muppet Newsman (appears as an avatar)