The ability to level up is determined by the star rank of Bronze, Silver, and Gold characters. Star to level caps only affect collectible characters. The bosses and NPCs that you meet on your way to victory can vary in level and star rank.
Here are the maximum levels a collectible character can reach based on star rank:
Here are the maximum levels a collectible character can reach based on star rank:
LEVEL 20
LEVEL 30
LEVEL 45
LEVEL 60
LEVEL 100