Also known as: 霊夢コス
A character (usually a Touhou character), disguised as Hakurei Reimu or wearing a variant of Reimu's costume.
If the picture depicts Reimu with raccoon ears and tail as well as a Leaf On Head and glasses, this is usually a reference to Futatsuiwa Mamizou's spell card Transformation "Pseudo-Exorcism of the Stupid Shrine Maiden" where Mamizou transforms into Reimu but keeps the animal features and thus, must use this tag if so.