Demon God

Background
The Demon God is the main villain of the series and is Satou from another parallel world. Also the tulet of the demons.

He was the first hero summoned by Akon Kagura and Parion and subsequently led the charge against the goblin demon lord. After he defeated the demon lord, he completed the trials of the gods to marry Parion and the gods then turned him into a demi-god in exchange for services provided.

Afterwards, he and Parion agreed on the 66 year demon lord cycle and each summon demon lords and heroes per directive of the other gods in order to keep the people of the world focused on killing monsters rather than each other and to keep the worlds Miasma levels in check. He also invented the classic style of magic and magic tools to give people the power to fight and also made the labyrinths in order to collect and make use miasma.

But after his defeat to the outsiders 30,000 years ago, he started to take his orders a bit more liberally in order to bolster his powers and to seek revenge against the outsiders, under the guise of protecting this world. He started to summon people from other worlds with high negativity and gave them unique skills that would turn them into demon lords should they ever take it to far. This in turn created more miasma and subsequently used it to make more demons and unique skills and subsequently gained a huge following.

After Satou appeared in the world, he saw his opportunity to gain the power necessary to fight after "princess" saw that his potential was ruined by gaining full god hood through divinity that was made with miasma, not worship. But after that plan failed due to interference of the gods, he and parion subsequently declared war on everything else.

Appearance
His appearance without the use of divine body doubles is exactly the same as adult Satou.