The Master of Masters

The Unknown is a hooded character introduced in Kingdom Hearts χ. The Unknown's true identity and purpose remain unknown.

Kingdom Hearts χ
After helping Chirishii fending off the Minute Bombs in Daybreak Town, the player goes to sleep, during which the player has a dream. In it, the player sees the five Foretellers and the hooded unknown in what appears to be a conversation. Before the player can approach them, he or she is engulfed by darkness and wakes up.

Appearance
The Unknown appears as a person completely concealed in a black coat. Nothing else is known about the unknown's appearance beneath the hood.