Coins and gems can be used to purchase additional characters. An additional five characters will also become available after you collect enough eggs.

Bluto: 10,000 coins
Bryan: 45,000 coins
Dizzy: 100 Gems
Foxworthy: 20 gems
Penny: 50 Gems
Pepper: 75,000 coins
Rolf: 50 gems
Rosie: 25,000 coins