Kingdom Key

The most prominent and famous Keyblade is the Kingdom Key. The key chain attached (the Mickey Mouse insignia) draws out the Keyblade's true form and power.

Sora first obtains the Kingdom Key during the destruction of the Destiny Islands. Mickey Mouse uses a similar weapon (the Kingdom Key with a reversed color scheme) that he obtained when traveling through the Realm of Darkness.

Stats
Also noted as one of the Keyblades of Fate (Blessed)