Jerga

Jerga (ジェルガ, Jeruga) is the general of the Gairadite Demon King Suppression Army and the King of Gairadite 2,000 years ago.

History
Jerga was the teacher of Kanon. Jerga held a strong grudge against demons after the death of his wife and child. In one incident, the Demon King of Tyranny, Anos Voldigoad, came to Azeshion to advocate peace with Kanon, but Jerga interrupted their conversation and attacked Anos, only to get gravely injured.

Even after the wall was made and the Demon King died, Jerga's hatred hadn't changed. He believed that the battle would not end until the Demon King, as ell. So he set up the Hero Academy to pass his resentment to his descendants. Kanon was strictly against the academy and it's purpose, wanting peace with the demons. The tensions between the two almost resulted in a civil war between the humans, which each side having many allies. However, Jerga waited for Kanon to drop his guard, and killed him, and in doing so, made sure that his hatred could be passed on. He altered the written history to make sure demons were viewed as cruel and evil.

But he was afraid that people would still forget their hatred of demons. So, at the cost of his life, he transformed his root into two forms of magic. One is the magic Sanctuary  and the other one is the magic Root Womb &lt;Eleonore&gt;. He managed to fuse his own root into , resulting in anyone who uses it sharing his feelings of hatred and resentment towards demons.

Plot
He was later killed by Anos with Venuzdonoa after fighting with Anos and the reincarnated Kanon.

Kanon
Jerga bet the future of humanity on Kanon, believing him to be the only one capable of defeating the Demon King of Tyranny.

Anos Voldigoad
Jerga utterly despises the demon race, specially the Demon King of Tyranny Anos Voldigoad, whom he blames for the death of his wife and child. Anos, in return replies that Jerga wasn't the only one that experienced tragedy, as Anos was born from his mother's corpse after she was killed by humans.