Ares, the original god of war, unless Kratos unseats him off of his throne and title. This was no easy feat and his boss fight is a testament to that. The battle between Ares and Kratos is one of the first truest combats between two gods.
Fear Factor. Kratos is afraid of being found by others who might know of his deeds. He's afraid of how his legacy will come to affect Atreus, his son, and he's afraid that if the boy knows his history, he'll despise him.
15 Hercules
Of all the champion children of Zeus, Hercules was the most powerful of them, well... other than Kratos. Hercules even at the end of God of War II's cutscene seemed to have already ascended to Demi-God status and had long surpassed his 12th labor.
12 Anos Voldigoad Can Destroy Kratos By Looking At Him
His name is Anos Voldigoad, and he is said to be the strongest demon in history. He was actually able to gravely injure someone with just his heart beat. Anos wields a sword called Venuzdonoa, which is capable of destroying anything in existence.
The two powerhouses face off in a heated battle between father and son. Kratos stabs Zeus with the Blade of Olympus, then Zeus uses the blade against Kratos.
1 Weakness: His Nightmares
Up until God of War III, Kratos is plagued by nightmares, which partially explains why he's so vulnerable to illusions and mind tricks. It also, of course, explains his unquenchable rage. At the end of the day, Kratos' nightmares are one of his greatest weaknesses.
This is because, for a decade (10 years), Kratos had faithfully served the Olympian Gods, yet, he felt like they didn't care about him or respect him, despite him doing their bidding. Plus, he felt like he was just a pawn to be manipulated and would, ultimately, be killed off, once he's outlived his usefulness.
It is also implied that he has an intense fear of Kratos as well, as he knows nothing about him except for the fact that he's extremely powerful and having fought and killed one of his sons, Baldur and his two grandsons, Magni and Modi in battle.
He's killed 19 Full blooded Gods.
Old Kratos from the Norse God of War games takes the trophy for the strongest Kratos. The character is older, wiser, more emotionally intelligent, and has the memories and guilt of his past to tie him into being better.
In God of War Ragnarök, it's likely that Kratos is around 1,055 years old. He's something of an old man, but as a demigod, he is still more than young enough to hold his own and then some in battle.
Blaming Kratos for having brought the war to Asgard and for the destruction to his family, the God of Thunder was blinded by anger and refused to listen to his enemies, who unsuccessfully urged him to stop fighting.
Out of all the Gods of War, Kratos was the most powerful and fearsome one, since he had the powers of Pandora's Box, the powers of the God of War that belonged to Ares, and plenty of weapons and magic from the other gods and the knowledge to use the godly powers by Athena after the death of his brother.
They're both really bad but Zeus had the excuse of being corrupted and was under the influence of Pandora's box which made him act the way he did while Odin was always selfish and manipulative on his own naturally.
He learned from a dying Athena that Zeus is, in fact, his father, a fact Zeus kept secret because he wished to avoid a repetition of what he did to his own father, Cronos. Kratos rejected any notion of a relationship and vowed to kill Zeus and destroy Olympus.
However, Kratos did not kill all the gods, and there are close to a dozen Olympians that managed to survive Kratos' path of destruction.
While he wouldn't know it for most of his life, Kratos was a demigod as he is the son of Zeus, but he would later become a full-on god, the God of War to be precise, after killing Ares.
It is documented that Greek gods grow stronger with age, and audiences have seen that with the sheer power and invulnerability of Old Kratos. As such, Old Kratos would win based on age.
KRATOS (Cratus) was the god or personified spirit (daimon) of strength, might, power and sovereign rule. He and his three siblings--Nike (Victory), Bia (Force) and Zelos (Rivalry)--were the winged enforcers of the gopd Zeus, angel-like beings who stood in attendance of the heavenly throne.
Angry-o-meter reading: 7/10
While in the Underworld, Kratos faces Hades. He ends up killing Hades and ripping out his soul. As if killing him wasn't enough, he just had to rip out the poor dude's soul. With this, Kratos releases all the souls of the Underworld.
Kratos is the Olympian god of force. In the 20th century, the Titan Typhon banished all the Olympians to the Land of Shades, but Hercules defeated Typhon and restored the gods to Olympus.
He makes no appearance in God of War 2, but in God of War 3, Poseidon was the first Greek God that Kratos killed. Upon his death, oceans flooded the world. Additionally, Poseidon is one of the four gods players can pledge allegiance to in Ascension's multiplayer.
Doom Slayer would easily get the upper hand early on thanks to his range. His weapons can unleash Hell on Kratos, thanks to the sheer variety of ranged pain at his disposal.
While it is true that the hammer would have been an incredible asset for the player, it cannot be wielded or even picked up by Kratos (nor Atreus) for several reasons.