Fragments

Fragments are character-specific items used to increase the star rating of a character. Many of them can be purchased in the Diamond shop or farmed in the Elite Combat Stages, while others are only available through special events (like Hit Egg). Universal Fragments are rare drops from specific boxes and can be used to upgrade any character. The highest star rating a character can have is 7.

The main character does not require fragments, but instead increases his star rating by progressing in the story. Currently, the highest attainable star rating for the main character is 6.