Kratos is the protagonist of the God of War series. Born in Sparta, Kratos was a respected soldier and General, up until he lost his wife and daughter when he killed them, albeit by accident, under Ares' command, earning him the nickname of "The Ghost of Sparta", after which he renounced his service to the war god, eventually killing him and ascending to Godhood before exacting revenge against his father, the Olympians and the Titans who betrayed him.
After successfully exacting his vengeance, Kratos escaped into the world of Norse Gods by settling down in Midgard in Ancient Norway where he married another woman named Faye and bore a son named Atreus who together, after the boy's mother’s death, would embark on a journey to spread her ashes at the highest peak of all the nine realms.
Born in the Greek city-state of Sparta, Kratos is the demigod son of Zeus and a mortal woman named Callisto, although he would remain unaware of who his father was for most of his life. Outraged at Zeus for fathering yet another bastard child, Hera ordered Kratos' execution on the day he was born, but the King of the Gods took pity on the child and refused, leaving him in Sparta to be raised by Callisto.
Like all Spartan youth, Kratos was monitored and trained for combat by the Spartan authorities; those who were deemed fit were to stay and be trained as Spartan warriors, while those who were deemed unfit would be sent to the mountains to fend for themselves. Already feisty and aggressive at a young age, Kratos trained together with his younger brother, Deimos, as they dreamed of joining the Spartan army when they grew up. Around this time, Zeus began to hear prophecies foretelling his demise at the hands of one of his sons, a "marked warrior". Hoping to circumvent the cycle of patricide before it was too late, Zeus sent Ares and Athena to hunt down and dispose of the boy who would one day rise up against him. Ares, noticing Deimos' strange birthmarks, decided to invade Sparta with an army of centaurs and take him to Thanatos, the God of Death. Kratos tried to save his brother, but Ares punched him into a pile of wood, leaving him with a permanent scar over his right eye.
Insulted by the mortal's defiance, Ares prepared to kill the young Spartan but was stopped by Athena. The Goddess reminded Ares that they had what they were looking for, and apologized to Kratos before disappearing into the flames. The loss of his brother left an indelible mark on Kratos, as he vowed to never falter again. In honor of his brother, Kratos had himself tattooed in the exact image of Deimos' birthmark. Kratos would later forget that it was Ares and Athena who took his brother from him and wouldn't realize it until after Ares' death.
As Kratos came of age, he became a respected member of the Spartan army, eventually marrying Lysandra and siring a daughter, Calliope.
Shortly after her birth, Calliope contracted a plague, causing the Spartan authorities to deem her weak. Spartan law required that she be thrown into a chasm and left to die. Determined to save his daughter, Kratos set out on a journey for the Ambrosia after hearing from an elder of its exceptional healing capabilities. But unbeknownst to Kratos, Ares had chosen him to be his champion in the wager of the Gods, a contest with the ultimate goal being the capture of the Ambrosia; the victor would have statues erected in their honor all throughout Greece. A battalion of Spartans accompanied Kratos on his quest, including Captain Nikos. Along the way, he encountered a healer who gave him the Flames of Apollo.
Kratos eventually encountered Poseidon's champion, Herodius, and killed him as the Spartans conquered his army and stole their ship. Enraged at Kratos for costing him the wager, Poseidon unleashed a handful of hazards at sea in the hopes of killing him but failed. Later on, Kratos encountered Artemis' champion, Pothia, and killed her as well, with her army also falling victim to the Spartans, although Artemis did not retaliate. In fear that Kratos would defeat his champion, Alrik, the Barbarian King, Hades sent a torrent of fire through the sky. Although he failed to kill Kratos, he succeeded in killing many of Kratos' men, including Captain Nikos. As he found the Ambrosia, Kratos encountered Cereyon, the Helios' champion, and killed him as well.
Alrik and his Barbarian army battled the Spartans for the Ambrosia, as Alrik's Father was very ill and in need of the elixir. After a grueling battle between the two leaders, Kratos successfully captured the Ambrosia at the cost of his own men and summoned an army of Rocs to continuously torture Alrik. Kratos then returned to Sparta and healed Calliope, obtaining the rank of 'Captain' from the King of Sparta.
At some point after becoming captain, Kratos would command a young soldier named Atreus who remained hopeful even in the darkest times. When the day came for Atreus to lay down his life in battle, he did it without hesitation and saved many others, earning Kratos' respect. The captain carried Atreus home on the soldier's shield and personally buried him will full honors of Spartan custom, acknowledging him as the only Spartan who ever had a smile on his face even in battle.
As a general, Kratos won battles through brutal, but effective tactics. However, his pride and hunger for power grew greater with every victory. Despite Lysandra's pleas, Kratos vowed to continue his bloody conquests "until the glory of Sparta is known throughout the world", spending time with his family only when he was able to return to Sparta.
He killed Ares and became the God of War and then had his powers to The Blade of Olympus then killed all the gods and Killed himself but he was alive and in Norse Mythology and had a son Named Arteus from Faye who died and now had ashes scattered around from Jotunheim from the Highest Peak and he also killed Baldur while his Son killed Modi and Magni.
And in the Legacy of Chris Thorndyke,
And he is reprised by Christopher Judge in the English dub and Kenta Miyake in the Japanese dub in the present and in the past, he is reprised by T.C. Carson in the English dub and Tessho Genda in the Japanese dub.