Foundling

Background
The Foundling is the nickname attributed to the protagonist and player character in the game world.

When a shell's durability is depleted, the Foundling is cast out of it. It can then continue to fight unprotected with limited health or return to the shell and re-inhabit it one more time, but losing the shell again will kill the Foundling.

Interactions
Other characters in the world will recognize the Foundling when it is not using a shell and will have unique dialogue that pertains to that status.