Kou Kimijima
The author of the Kimijima Reports, who died several years ago. Spoiler It turns out that he works for the Committee of 300 and caused the Anemone-gou incident which was in fact an experiment that would have killed all the test subjects; This was stopped by Misaki who killed him. However before his death he uploaded his consciousness to the internet and lives on through Iru-o, and now plans to execute the Committee's plans by inducing a massive solar flare that will kill the majority of the population of Earth. He uses the Kimijima Reports to manipulate people, and he has Geji-nee and Misaki (who was brainwashed by him) do his bidding in the the virtual and real worlds respectively. In the end he is defeated by Kai using a virus created to destroy him by Daru. (Source: Wikipedia)