This article is about the visual element.
You may be looking for the Mission Mode item.

Crowns are customization items that appear in Kingdom Hearts II Final Mix, Kingdom Hearts χ and Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-, which are obtained after completing specific side-missions.

Kingdom Hearts II Final MixEdit

A crown costume modifications are unlocked by obtaining Proofs. These are equipped on Sora automatically and are present at all times, except during cutscenes and while Sora is in a world-specific costume. There are several types of crowns; possessing one Proof grants Sora a copper crown, two a silver crown, and all three a gold crown.

Kingdom Hearts χEdit

In Kingdom Hearts χ, crown accessory items are monthly ranking rewards for events and the Dark Corridor Trials, they are named after the zodiac. Four variants are available: Gold, Silver, Bronze and finally "Charm", which is actually a hair decoration and not a hat like the rest.

Name Aries Taurus Gemini Cancer Leo Virgo Libra Scorpio Sagittarius Capricorn Aquarius Pisces
Gold                        
Silver                        
Bronze                        
Charm                        

Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-Edit

Bronze, silver, and gold tiaras can be earned as part of the Wardrobe system.