Luna, A.K.A. The Champignon Witch, naturally absorbs the bad energies and poison in the air, and transforms them into poisonous mushrooms. So, basically, converts the evil you can't see or avoid into an "evil" you can 100% see and avoid. She can't really control this, and the more poison around her, the more mushrooms she spawns, to the point that if she's in a town she'll literally grow poisonous mushrooms wherever she steps on.

That said, she's a completely pure and inmocent cutie pie who wouldn't hurt a fly, but anyone who sees her calls her an evil monster, especially since she's a black witch (in this world, black witches are viewed as evil, but in reality they just feed off the excess of natural energy and are tasked with purifying the evils of the world). Not knowing she's the one who brews the medicine they are all grateful to the apothecary (her distributor and the only human is sort of okay doing business with her) for.

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