God

You are correct; humans are foolish.

An enigmatic entity referred to as God (神, Kami) by Homeless Emperor, and Psykos, and referred to as Him (ヤツ, Yatsu, Viz: It) by Blast.

Appearance
In its first appearance, God looked like a swirling gust of wind with scribbles that outline a person. God is described by Psykos as reminiscent of Jupiter's surface with countless spiraling spots overlapping over one another.

When Saitama, Flashy Flash, and Manako peered through a hole while they were underground, God appeared to look like an extremely massive humanoid entity, so much so that it completely dwarfed the hole they peered into. Though none of them could see it.

Personality
God gave Homeless Emperor its powers and enhanced the abilities of Psykos, although its motives remain unknown. God apparently agrees with Homeless Emperor's belief that humanity is a worthless plague on an otherwise grand and beautiful planet.

It also has the tendency to test whether people are worthy to receive its power or not through a Mysterious Cube. If not, they will be "collected", presumably taking their lives away.

It mercilessly takes away Homeless Emperor's powers and kills him after his defeat.

Monster Association Arc
God is first seen in a flashback as Homeless Emperor recounts his backstory to Zombieman. He describes how he stumbled upon it in the park one day. It compliments Homeless Emperor for his "correct" ideology but states the human has no reason to die. Instead, it gave him the ability to summon and control energy spheres at will, telling the newly-empowered human he should know what to do with this power and leaving.

During the fight between Orochi and Saitama deep underground, Orochi reveals a tablet he discovered in an ancient shrine, which depicted Orochi and stated that a worthy sacrifice was needed in order to resurrect "God", leading Orochi to believe this was referring to him. Soon after, the hero easily defeats Orochi with a single punch. Before the ancient cave collapses, his remnants crawl to the tablet while the full picture of the actual "God" appears in the mural and is unseen by the Monster King.

God is later seen in another flashback as Psykos recounts how she obtained the source of her enhanced power. She describes it as a huge mass of brain cells with a similar appearance to that of Jupiter's surface.

God later communicates to Saitama, Flashy Flash, and Manako after they touch a cube. It is surprised that there are three of them, and then tells them to touch the cube in order to either gain power if they are worthy or have it confiscated if they are not. The three of them make no decision as Blast suddenly appears and confiscates the cube himself. Before the hero teleports the cube to an unknown location, God makes a final shocked comment as to the presence of Blast.

After Homeless Emperor's defeat, when Zombieman begins inquiring more about the entity Homeless Emperor was speaking of, he suddenly sees a colossal figure appear and stand on top of the moon. The entity then appears in his mind, only with its appearance being changed into a colossal giant of flesh and fractured bones. It then expresses its frustration at Homeless Emperor's failure and takes away his power and his life.

Abilities and Powers
Crossing the vast expanse of time, our god shall resurrect on this Earth. When on this altar... a worthy sacrifice is offered.

Little is known about the full extent of God's abilities. The appearance of one of God's Mysterious Cubes was enough for the top-ranked S-Class hero, Blast, to show up. Since the hero is said to only take action when humanity faces a true crisis, it can be presumed that God is an extremely dangerous threat.

Supernatural Abilities
Power Bestowal: The enigmatic entity is capable of granting supernatural powers to individuals. It gave Homeless Emperor the incredible power of summoning energy spheres similar to little suns that explode on contact and create huge and flaming bursts. It also gave Psykos and Orochi a massive boost in power during their fusion, enough to contend with Tatsumaki and increase their attack potency to a continental scale. Additionally, God can grant powers to individuals who place their hands on one of the Mysterious Cubes and then state their wishes. However, if they are not worthy to be bestowed upon, they will face confiscation. It is also capable of taking back the granted powers along with the lives of the wielders.

Mind Incursion: It was able to get inside Homeless Emperor's mind and communicate with him. It was also able to freely change the appearance of its projection in Homeless Emperor's mind.

Telepathy: God can mentally communicate with anyone who touches one of the Mysterious Cubes. It first uses telepathy to communicate with Flashy Flash, Saitama, Manako, and Blast.

Quotes

 * (To Homeless Emperor) "I will grant you power. What to do with this power, you should know."
 * (To Saitama, Flashy Flash and Manako) "Three visitors at the same time? How unusual. Let me see if you are worthy vessels to bestow my power upon."
 * "Place your hand on that box and make a fervent wish. If you are worthy, you shall gain power from it. But if not, you will face confiscation."
 * (To Homeless Emperor) "Silence. I am taking them back. Your power, your life, they are both forfeit."

Trivia

 * Murata stated that Homeless Emperor's energy-based powers are the same as Choze and Vaccine Man's.
 * Like Homeless Emperor, Vaccine Man also claimed to be on a sacred mission to destroy humanity, but stated that it was "Mother Nature" he served, rather than "God."

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Dieu Бог Dios