By analyzing the in-game clues in God of War (2018) along with actual Norse Myths, it's possible to make a number of predictions about what Kratos and his son Atreus will get up to in God of War II, along with the role they'll play in Ragnarök, the final stand of the Aesir and Vanir gods.
Thematically, the God of War franchise has always been about Gods struggling against their destinies. In Greek mythology, Zeus and the Olympians struggle to halt the cycle of children killing their parents. In Norse Mythology, Odin and the gods of Valhalla search for ways to avert Ragnarök, their apocalyptic final battle. Both sets of gods commit great atrocities in an attempt to avert their fates... which inevitably creates the enemies destined to kill them. Kratos, the titular "God of War", is a prime example of this cycle coming to pass.
After murdering practically the entire Greek Pantheon in the first God of War trilogy, Kratos and his young son Atreus go on a quest to scatter their dead wife/mother's ashes from the tallest mountain in all the realms, a humble journey that puts them in the cross-hairs of several Norse Gods. For all the god-killing and thrilling visuals of God of War, it's clear that greater deeds (and gameplay) await Kratos and Atreus in the next God of War game – events hinted at by in-game allusions and the Ragnarök myths detailed in the Prose Edda text.
(WARNING: A huge amount of Spoilers and Conjecture follows.)
Atreus Will Learn to Shape-shift
Halfway through the story of God of War, Atreus learns about his divine heritage and asks his dad if he can turn into animals, and later, during the climax, players learn that Atreus's birth name is Loki Laufeyson, the shape-shifting, red-headed trickster god destined to start Ragnarök. Both these facts strongly suggest that Atreus might be able to assume the form of both animals and enemies in future God of War games.
Fenrir Will Be Unchained
In Norse myth, Loki used his shape-shifting abilities to birth massive creatures such as Jörmungandr the World Serpent, Sleipnir, Odin's eight-legged horse, and Fenrir, the great wolf destined to devour Odin during Ragnarök. If Kratos and Atreus do ever decide to take the battle to the Norse Gods, it's likely that they'll try to seek out (or create) Fenrir as an ally or weapon. If they do wind up crawling through Fenrir's belly as they did Jörmungandr's in God of War, they may also wind up recovering the hand of Tyr.
Rumors of Tyr's Death Might Be Exaggerated
Tyr, the Norse god of war who let Fenrir bite his arm off in order to lure the mythical wolf into a trap, could return. Despite being treated as dead throughout God of War, Tyr is lionized throughout the game as a peacemaker, expressing ideals that Kratos and Atreus admire. For this reason, future God of War games are likely to include side-quests in which Kratos and Atreus need to recover Tyr's arm as a weapon... or even possibly return it to a Tyr who faked his death.
Odin Will Disguise Himself As a Quest-Giver
Odin, beyond a few ominous ravens, is conspicuously absent in God of War, something in-character for a kingly god who prefers magic and trickery over physical confrontations. In the Prose Edda, Odin has a reputation for disguising himself as an old, grey-cloaked wanderer, seeking forbidden sources of wisdom and meddling in the fate of kings and warriors. What better disguise to lead Kratos, Atreus, and the players astray than in the guise of a humble, helpful giver of quests?
Until the release of the new God of War game, the future of Kratos and his son Atreus will remain unclear. Will they break the cycle of dying pantheons and sons slaying their fathers, or will their efforts to change their fates with violence bring the very futures they want to prevent? Judging from the many, many myths the franchise has to choose from, anything is possible.
Source: Games Radar