Kaffi is a character found in Tears of the Kingdom.
Tears of the Kingdom
Kaffi is wandering around, looking for the Great Bandit Misko's legendary treasure. Kaffi mentinos that it is found in a cave nearby, but they can't seem to find exactly where the cave is. Kaffi is referring to the Whistling Hill Cave, located just to the east. Link can break the boulders to find the cave and inside, there is a treasure with the Rubber Armor.