Sonic Forces

Creating Additional Avatars:
When you begin a new game you will only be able to create one custom avatar for the campaign. However if you complete the main story you will unlock an option to create new avatars and switch between them at the avatar menu. This feature can be used to complete animal-specific missions.

Unlock Sonic's Shoes:
When you complete the game (Stage 30) you will unlock Sonic the Hedgehog's shoes for your avatar character to wear.