Church Keeper
Church Keeper is an NPC in Hollow Knight: Silksong. They appear to be carrying a large woodwind instrument.
Hornet meets Church Keeper just as she makes it out of the Moss Grotto from the Old Church and collapses. They act as a mentor of sorts throughout her journey in Pharloom.[1] In the trailer, they are seen singing while Hornet plays her Needle.[2]
In the Moss Grotto demo, they witness Hornet falling unconscious on the ground and start laughing, right before the end of the demo.[1]