Contrary to many first-time players' expectations, it is not the player character. Unlike the Knight, it has a crack in its skull, has only one arm, and is sometimes depicted with solidorange eyes.
The young form of this character uses this tag, as the Pure Vessel tag is only used for the form of the character seen during the Pure Vessel boss fight.
The final and penultimate boss for different endings, The Hollow Knight is a child of the Pale King and the White Lady, born and trained to be a vessel for the Radiance. It was once the Pure Vessel before being corrupted by the Radiance.
