Myla

A happy little miner identical to Husk Miners, save for her uninfected eyes, mining for treasure near the entrance to Crystal Peak.

When first met, she's mining and gleefully singing, hoping that the Knight will come visit her again later.

Once the player has acquired Vengeful Spirit, her dialogue changes, then later once they have obtained Desolate Dive, she will have lost her cheerful tone and seem rather lethargic or confused.

After obtaining the Crystal Heart, Myla turns into another infected Husk Miner. If the Knight kills her after this, she will let out a cry after being killed.

Her dialogue as well as her Dream Nail dialogue after Desolate Dive have been obtained shows another voice whose words are all uppercase. Since the Dream Nail dialogue of the Radiance is also completely in uppercase, and the voice is commanding Myla to kill the Knight, this other voice is possibly the Radiance herself.

Trivia

 * She starts showing signs of being infected after having acquired Desolate Dive from Soul Master.
 * Early stages in development showed Myla with a slightly different design. In the Hollow Knight Kickstarter Myla was accompanied by a male voice as well as being referred to as The Miner.

Мила Myla