Warning: Contains spoilers for One-Punch Man chapter #156!
In One-Punch Man, the mysterious being known as "God" is slowly being set up as the main antagonist of the series. His true power and goals are still unclear, but what has been shown of God until now makes him a worthy opponent for the over-powered protagonist of the manga, Saitama. To get ready for that inevitable showdown, let's have a look at everything that has been revealed until now of God.
The character first appeared in chapter #109 of the manga, in a flashback detailing the origins of Homeless Emperor, one of the top executives of the villainous Monster Association. God is the entity that granted Homeless Emperor his powers, transforming him from a homeless man into a «Disaster Level: Dragon» monster who defeated many top-tier heroes. Later, God appeared in a vision had by Psykos while she was trying to merge with the «King of Monsters», Orochi. God appeared to her as a huge mass of brain cells, bestowing upon Psykos an even greater power and, more interesting, the sense of a greater destiny waiting for her. God finally appeared to Saitama, the S-Class hero Flashy Flash and the monster Oculette, when they touched a strange, cube-shaped object, and were able to hear God's voice in their heads. He offered them to make a "fervent wish", to see if they were "worthy vessels to bestow my power upon".
Related: Saitama Makes a Less than Triumphant Return to One-Punch Man
It appears that God, then, acts by bestowing power upon individuals that he either reaches out to or comes in contact with one of his cubes, described by the number one hero Blast as transmitters that distort space and allow for communication with "him". God's gifts, however, come with a price,
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