Jei is a simple soldier. He likes to say that he is no more and no less, a loyal warrior of Myri who lives to do nothing more than shed blood in Her name and become one of the stronger males of Taloba.
But that simple half-truth serves to deny Jei entirely, as he is only a simple solider on the surface. The boy is a much more uncivilized being than he appears to be, far more animalistic and bloodthirsty than he claims. He is a wild, uncontrollable individual with a lust for war only trumped by Myri herself.
Yes, he eats people. Most Myrians do, but while their feasting usually only extends to post-war rituals, Jei gorges on the flesh of humans when he is able to and with the love any man would show with his favorite dish. He isn't addicted or mentally ill, per se, but he simply finds it the best tasting meal a person could find, with the ability to nourish him better than anything else could.