Oatomilla

Oatomilla is a fictional creature from the anime series "Mushishi". It is a type of Mushi, which are supernatural entities that exist as the most fundamental forms of life, predating all other life forms. Mushi are not inherently good or evil, but their interactions with humans can cause various phenomena, often referred to as "Mushi-kui" or Mushi-sicknesses.

Oatomilla are described as being large and luminescent, often appearing as glowing orbs or masses of light. They are known for their ability to manipulate sound and light, creating illusions and affecting the perceptions of those around them. Specifically, Oatomilla are associated with the phenomenon of auditory hallucinations, where individuals hear sounds that are not present in reality, often described as whispers or chanting.

When an Oatomilla attaches itself to a human, it can cause them to hear these phantom sounds. In some cases, these sounds may be harmless, but in others, they can be disturbing or even maddening, leading to distress and isolation for the afflicted person. The "Mushishi" Ginko, the protagonist of the series, encounters and deals with Oatomilla by understanding their nature and finding ways to either help the affected individuals cope with the Mushi's influence or to gently guide the Mushi away without causing it harm. The resolution typically involves restoring a balance between the human and the Mushi.