Li Gan

Ri Gan is the Sage of Mirror Lake.

Background
Although he is a mage, his interest lies on magical research especially a global-level magic. His knowledge is vast, one of a few people who recognised that Elder Tale has been altered by magic three times in the history, and he named it World Fraction. He found in the archive that Shiroe first appeared 98 years ago and believe that he must be an archmage based on the frequency and activeness, leading him to contact the guild master of Log Horizon directly to discuss the World Fraction and the Spirit Theory.

An Invitation from Eastal
During the Round Table Alliance's arrival at the Ancient Palace of Eternal Ice, Ri Gan sensed the person he had been looking for has arrived while inside his private library.