Jinn

Steel Soul Jinn is an NPC exclusive to Steel Soul Mode, replacing Confessor Jiji in the cave at the east end of Dirtmouth, due to permanent death making Confessor Jiji's service useless.

She is located inside the cave in Dirtmouth and will buy Rancid Eggs for each.

Steel Soul Jinn states that she is too young to tell much about herself, although she does say that her body is unable to take damage. She mentions her friend who appreciates the Rancid Eggs that the Knight can trade with her; this friend is most likely Confessor Jiji.

Trivia

 * An upcoming enemy revealed in the Silksong trailer bears striking similarity to Jinn. It is also a companion to Steel Assassin Sharpe furthering some sort of motif of "steel" between the characters.
 * Jinn was confirmed by developers to be female.
 * She is mistakenly referred to as male in some translations of the game.