Shomonkai Founder

Also known as Kuzuryu, the founder of the Shomonkai is seen making various speeches throughout the lockdown. He is one of the only two people in the Shomonkai who are allowed to speak of demons, and is knowledgable about the war of Bel.

History
Note: Spoilers will occur The founder studied religion in college, which gave him knowledge of the future ordeal arriving. Believing that humanity would be unable to withstand God's ordeal, he formed a contract with the demon Belberith in order to destroy God and prevent the ordeal from occurring. In an attempt to bring more strength to the demon, he formed the Shomonkai to worship Belberith, who he called 'His Majesty'. He is also Amane's father, and entombed the demon Jezebel inside of her, which brought Remiel in to help her.

It is also assumed that he was the one to commission the Demon Summoning Program, in order to bring more demons across and aid in the summoning of Belberith. If this is true, then ironically he is responsible for the ordeal he feared the most.

Storyline
If you choose to go to Shinjiku on 'The Day Before', you will encounter Kuzuryu giving a speech about the coming ordeal. You can express interest in his speech, or not, but he will not speak with you.

Later in the lockdown, you can either see him when you go to ask Azuma about Belial, where he is surprised to find you have knowledge of the war of Bel. Kuzuryu also says that the King of Bel has already been decided, which is assumed to mean Belberith. He is also seen arguing with Amane about the proper way to end the lockdown, which Amane believes can be ended without summoning His Majesty.

Once you go to battle Belberith, regardless of which route you choose, except in Yuzu's 8th day, you will find Kuzuryu getting ready to summon Belberith. If Amane is in your party, he will berate her about betraying the Shomonkai. In Naoya's route, he will be furious with the protagonist for attempting to take the power of Bel for himself. He then pleads with Belberith to take his body and destroy God in return. Belberith is then summoned, and reveals that he has consumed every bit of Kuzuryu, body and spirit.

If Amane is in your party after defeating Belberith, she will mourn for him, but follow you to Babel regardless.