The various characters that comprise the Addams household are unlocked by level. When you unlock a character in Addams Family: Mystery Mansion it moves the story forward so you should be wanting to unlock new characters as quickly as you level up. When a character is readily available to unlock they will appear in the estate with an exclamation mark alert and can be acquired by investing the shown amount of Addams coins. Once a new character has actually been unlocked you will have the ability to play their story missions.