Humane Demons and Demonic Humans?

P.S First time author so any lovely criticism is welcome and by the way I am mostly doing cuz I’m bored Tales place in a world. This world is special cuz the roles are reverse. The Humans are demonic like beings while the demons are more Humane but can be very savage. The Humans have nearly destroyed the demonic empire and the surviving factions into hiding. The MC is the sole survivor and a VERY NORMAL DEMON. He saw his parents killed and his sweet little sister burned to death. Will he become a true demon and kill all of these savage monkeys? Btw not my pic for the cover