Tokoyami

The Tokoyami are Mushi that exist in shadows and come out at night. It eats smaller mushi and people's memories. They also contain the Ginko.

Description
These Mushi species are created when living beings are exposed to the light emitted by the Ginko for a long time. When one living being is exposed to the light emitted by the Ginko for a long time, they turn into Tokoyami. This is also the reason how Tokoyami came into existence.

If one is ever swallowed by the Tokoyami, first one must keep one eye closed and the other open. One may escape from this Mushi by using this method, but only able to remember at least one thing, a name, even if it isn't personal.

Plot
Before the start of the plot of the anime series, Yoki an 11 year old boy was swallowed by the Tokoyami, although he managed to escape but only after being exposed to the Ginko thereby turning his hair white and one of his eye's green. Yoki was only able to remember one name, Ginko, which was the name of the Mushi within the Tokoyami.He then went by the name Ginko and became the protagnist of the series Mushishi.

Weaknesses
It has an affinity for Light.