Pure is the protagonist of Mementos.
In the dream world, Pure appears as an entirely black silhuoette with shoulder-length hair. It is not known what she looks like in the real world.
Judging from some of her dialogue as well as the villager's dialogue, Pure is a rather friendly person. She is also a determined person, going further into the dream world by herself to free everyone else.
Pure, along with the rest of her village, gets trapped in the dream world after a strange black mist covers the sky. Pure eventually takes the challenge of collecting every memento so that the village can escape back to reality.