The Wink
How to unlock: Complete Electra's Short Story, then spend 7000 at the shop.

Non-flaming Human Torch Costume
How to unlock: Complete Human Torch's Medium story, then spend 5000 at the Comic shop.

Hazmat
How to unlock: Complete Iron Man's Short Arcade, then spend 8000 at the Comic Shop.

Electra
How to unlock: Complete Wolverines story on Medium and then spend 6000 in the Comic Shop.

First Alternative Costume for Characters
How to unlock: You must complete a given character's short story.

Negative Zone
How to unlock: You must complete Huma Torch's long story, then spend 9.9k in the comic shop.

Second Alternative Costume for Characters
How to unlock: You must complete a given character's medium story.