Kan Shu is a General from the state of Qi.
So far he has only been mentioned and never made a real appearance.
He was supposed to be summoned by Kou Shou alongside General Den Kaku to lead the Qi Army in an all-out war against the coalition army in the event the enemy advances further than the City of Jouan.
However, due to Mou Bu and his army attacking the coalition army's rear and the coalition army would only capture Qi Cities as far as the City of Jouan and it was there that they disbanded for that there was no need for the summoning.
Kan Shu is based on a real historical general Yan Ju.