#1 Fred - "Best Friends" Set
Character in the Set: Hiro Hamada, Baymax, Go Go Tomago, Wasabi, and Honey Lemon

#2 Fred Super Suit - "Suited Up" Set
Character in the Set: Hiro Super Suit, Go Go Super Suit, Wasabi Super Suit, and Honey Lemon Super Suit

#3 Alistair Krei - "Top Dogs" Set
Character guesses: Characters in a position with authority, like the King (Tangled) Felix, etc...
Unconfirmed. Let us know in the comments what worked for you!

 

#4 Yokai - Daily Missions
This character can be unlocked by collecting 6 daily mission stamps.

 

#5 Fred's Dad - Action Unlock!
Play as Fred (Big Hero 6) and hop 250 times (to score 250!) within a single run.

 

#6 Tadashi - Daily Missions
This character can be unlocked by collecting 6 daily mission stamps.

 

#7 Yama - Action Unlock!
Play as Hiro Hamada (Big Hero 6) and hop 50 times within 15 seconds.

 

To unlock Robert Callaghan, you play as Alistair Krei (secret character) and find him. He can appear multiple times throughout a game.

 

#10 Heathcliff - Action Unlock!
Play as Fred Supersuit (Big Hero 6) and find the character Heathcliff.
Added in the Monsters INC update.

 

NEW #11 Abigail Callaghan - Action Unlock!
Play as Hiro Super Suit and find Abigail Callaghan.