Tokiko

Tokiko is probably just one of the many weak youkai in Gensokyo. She seems to value and enjoy books. She is known to argue with Rinnosuke often, but despite that has never officially been given a name. In Curiosities of Lotus Asia Tokiko was beaten and robbed by Reimu. "Tokiko" is a popular fan name; 'toki' means crested ibis, a bird which she resembles in appearance. Her true name is unknown, but she is sometimes (more properly) referred to as "Unnamed Book-Reading Youkai" (名無し本読み妖怪). (Source: Touhou Wiki)