God

A God in Seraph of the End is referred to in passing in the figure of speech sense and referred to as if an entity by characters. It is said that his throne is at The Sun. Having not been seen or heard from, God's existence and behaviour is implied from others' views and behaviour in response to what they know of him.

Appearance
Unseen, where seraphs may live with him on the Sun they have smoke, to charred wood like appearances, though whether the God appears as a fiery related being giving its environment remains unknown.

Personality
According to Shikama Doji, a being who is unsympathetic to the suffering of humans and has been murdering a great number of them over years, god has a much more twisted personality than him.

He is said to punish arrogance, not forgive suicide, and curse others. From others' accounts, God is implied to administer death related trials as part of his plan. Fates worse than death were also used by God.

Prehistory
While he does not appear, God is mentioned by the King of Earth Sika Madu when he announced the progress of the satellite kingdom's efforts to return angels to the Sun, where God was said to await on their throne. He is mentioned when Paimon spoke to Bael that God was not forgiving of betrayal.

When Paimon was attempting to murder Mikaela, it is due to that God would notice him eventually. In discussion, God is mentioned when Paimon stated that he would punish the King, Sika Madu if Mikaela's forbidden existence was learned about. Where curing illnesses is forbidden it is stated by Paimon that God would punish Sika Madu and it would be far worse than simple death.

For God's anticipated punishment, it is said Sika Madu intended to endure it alone to protect Mikaela. God was also in Mikaela's mind when he was considering whether his own existence was a problem for his father. With Paimon and Mikaela having taken their lives, God was said to not be forgiving of suicide by Bael.

He is mentioned when Bael stated that Paimon wanted Sika Madu to return to God's side. Additionally regarding the deaths, they are seen as happening in accordance with God's plan where Bael felt it was a trial. God was referred to by Bael when he stated he never wanted anything of him. Believed to have a plan though, God's one was prepared to be followed by Bael. As Bael left with Paimon, that events could be all part of God's plan was raised as a thought.

That the source of God's power is light was known by Sika Madu. Returning to God's side was why light was gathered in the Tower of Babel. Stated that all light was God's power, it appeared the case that he had decreed that resurrection, apothanasia, and creation were taboo. That God punishes resurrection was why Sika Madu created Mikaela in secret, where it was believed it was done without his knowledge.

Spoken to directly (for the first observable time) God was unresponsive when Sika Madu displays the corpse of the created life Mikaela and asks if he has been forgiven. On whether he is testing the limits of Sika Madu's perceived arrogance it also questioned, as was the possibility that he was not even bothering to watch.

If God could communicate via the light Sika Madu looked up to then he did not respond. It was the same when Sika Mady stated that he would use Babel's light to resurrect Mikaela. If God was able to hear this he also would have heard that the light to resurrect all angels and extend their lives had been concentrated into seven keys held by Mikaela. Ever silent, God is referred to when Sika Madu stated he never graces him with an answer.

Mentioned, Sika Madu intended to hide from God's sight as he directed a homunculus named Yu to convert Babel's light into darkness to resurrect Mikaela and bring everyone back. He was on Sika Madu's mind when he is contemplating how there is no punishment, and asked if he permits this, or has not noticed.

On his orders or not, seraphs used their trumpets to target the homunculus who was darkening halos of light in Space, as well as blast their energy into Earth.

Story
At Nagoya airport where Mirai Kimizuki is controlled by the The Fifth Trumpet who has brought Abaddon to the world, Kureto Hīragi comments that even if god himself is their enemy then humanity will prevail.

After Kureto answers that Tenri Hīragi called him an old god, a god is stated by Shikama Doji to have a much more twisted personality than him.

Powers and Abilities
For the possibility of being omniscient there appears the impression by Sika Madu that activities can be hidden from god.

Light is said to be the source of God's power, and given it is also the source of angels' lives it may be that God can create angels.

"The source of God's power and angels' life... ...Is light. Light can make miracles happen."

- God's light based powers of resurrection, apothanasia, and life creation.

Shikama Doji
The King of Earth who God is implied to have had at his side at one point. His potential punishment of taboo actions weighs heavily on Sika Madu's mind, but does not deter his intent rather has him act to circumvent it.

Paimon
That God administered divine punishment for creating life was the reason Paimon sought to kill Mikaela so as to spare Sika Madu punishment for doing so.

Bael
God is seen by this angel as giving trials such as death as part of his plan. For the powers he had, they were not desired by Bael. If God had a plan it was willing to be followed by an angel fine with following whatever orders.

Mikaela
That God was said to mean to punish Mikaela's father for creating him heavily impacted his fate. To spare Sika Madu punishment from God, Mikaela took his own life.