During the game you unlock secret costumes to the playable characters, here the full list of it:
- Scout: Based on Scout from TF2. It's unlocked beating the first world collecting all the Orbz.
- Rayman: Based on Rayman from Rayman series. It can be buyed on Wario's Shop for 300 coins.
- Sam ("DLC"): Based on Sam from Sam & Max series. It's unlocked after you beat a DLC world.
- Koopa Troopa: This one can be changed to Green, Red, Blue and Yellow, to unlock beat a boss with Sam
- Yarn: Sam made of yarn. Beat Sam's Yarn.
- Alex Suit (DLC): Based on Alex Ember Koopa, you must beat the Koopalings' Madness DLC World as Sam to unlock it.
- Orange Bird Costume: Based on Orange Bird from Angry Birds. To unlock this, defeat 100 enemies.
- Wreck-It Ralph Costume: Based on Wreck-It Ralph. Unlocked by beating 20 enemies in 8-bit Town.
- Swampert Suit: Based on Sam's favorite Pokémon. Unlocked by swimming on water for 2 minutes.
- McCloud: Based on Fox from the Star Fox series. It's unlocked after you beat the Star Spark 64 minigame.
- Han Solo: Based on Han from Star Wars franchise. Beat T'S' Star Wars to unlock this costume.
- Pyro: Based on Pyro from TF2. Get all the Orbz from World 7 to unlock this costume.
- Spiky Shy Guy Yellow: Beat 5 bosses with SGY.
- Striker Shy Guy Yellow: Collect all Orbz in World 5.
- King Boo Face : Clear Shy Guy Gun
- Skips Suit : Beat 7 bosses with SGY
- 8-Bit Suit : Clear Shy Guy Gun in hard
- Zombie Suit : Beat 100 enemies with SGY
- Yinyang shirt: Elise's yinyang shirt worn on Swapnote. Default.
- Trainer Touko outfit: The outfit worn by Touko from Pokémon Special. Unlocked by completing the world The Secret of Rushing as Elise.
- Reaper cloak: A black hooded cloak similar to that of Rose Reaper's. Complete the world Nightmare Realm as Elise.
- S.O.S. Brigade uniform: The outfit worn by Haruhi from The Melancholy of Haruhi Suzumiya. Unlocked by completing the minigame I see you shipping down there as Elise.
- Yata Kitty costume: A random kitty-esque outfit. Unlocked by completing the world Cat Rainbow as Elise.
- Knight of Skyloft uniform: A Skyloftian Knight's uniform. Unlocked by completing the world 8-bit Town as Elise.
- Shadow Princess dress: The outfit worn by Elise's Adventure Time persona, Shadow Princess. Unlocked by completing the world Nova Woods as Elise.
- Goddess Touko outfit: Elise's God Tier outfit seen in Yatastuck. Unlocked by completing the world Land of the Banned as both Elise and Osaka.
- Abed: Based on Abed. To unlock this costume, the player needs beat the Paint-Insane-Ball minigame.
- Dark Abed: A Dark version of Abed. To unlock this costume, the player needs beat Paint-Insane-Ball in a record time.
- Finn Costume: A costume based off of Finn the Human from Adventure Time. His demon sword is strapped to his backpack.
- Jake Costume: A costume based off of Jake the Dog from Adventure Time. Your shirt and pants appeared an orange-yellow color, and you wear a cap resembling Jake's face.
- Beemo Costume: A costume based off of Beemo from Adventure Time. You wear Beemo-styled clothing.
- Ice King Costume: A costume based off of the Ice King from Adventure Time.
- Dipper Pines Costume: A costume based off of Dipper Pines from Gravity Falls.
- Mabel's Sweaters: A custume based off of the sweaters that are worn by Mabel from Gravity Falls.
- Questiony the Question Mark Costume: Soos' costume Questiony the Question Mark from Gravity Falls.