Myla

"... how much longer... KILL IT... how much longer... DANGEROUS... how much longer... KILL IT... how much longer... KILL THE EMPTY ONE..."

- Myla's Dream Nail dialogue after becoming infected.

Myla is a minor antagonist from Hollow Knight. Originally a young and cheerful Husk Miner, over the course of her game her memories are slowly sapped away by the Infection until she is nothing more than a feral monster like the rest of the creatures of Hallownest that have been infected by the influences of The Radiance.

History
Myla is first found in a mining cavern in the Forgotten Crossroads connected to the Crystal Mines mining off ore, singing to herself one of her favorite rhymes. She then encourages the Knight to sing along too, as it helps her concentrate with digging. After the Knight collects the Vengeful Spirit spell, she remembers the second verse of her song, and explains how she plans to find a valuable ore.

While her clumsiness and her tendency to forgets intervenes with her work, she remains kind to the Knight. This is short lived, however, once the player defeats Soul Master, Myla stopped mining and humming, bearing the yellow pupils of infection. She instead stands about and seems rather lethargic or confused, questioning herself. Her Dream Nail dialogue also changes, replacing most of the lyrics of her song to “kill”, particularly to kill the empty one, which is presumed to be the Knight themself.

After collecting the Crystal Heart within the Crystal Mines, Myla becomes a regular infected enemy, attacking the Knight the instant they come in sight. The player is given the option to fight back and end her misery, and should they do so, she lets out a dying cry. Unlike other enemies, she will never respawn after death.

Trivia

 * Myla is one of the four infected bugs who can be interacted with, the others being Sly, Bretta, and the Moss Prophet.
 * Unlike the other three, Myla is the only one who turns hostile; Sly and Bretta snap out of their delusions when interacted with while the Moss Prophet is killed by Infection.
 * In her Dream Nail dialogue after the death of Soul Master, there appears to be another voice in all capitals encouraging her to kill the Knight. These may be the Radiance herself.
 * If the Crystal Heart is collected before defeating Soul Master, Myla will continue mining regularly until Soul Master is defeated, where then she will become an enemy.