A/N: after watching Both of D Man1954's videos on about either kaiju on them becoming the villain. However, I decided to do my own thing on this.
And what I mean from this is how they can do the film without any of the two being the "Villain Kaiju".
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Now anyone who's watched Kong: Skull Island and read it's sequel comics knows that there no way at Kong being the bad one here.
As Monarch embarks on a perilous mission into uncharted terrain and unearths clues to the Titans' origins, a human conspiracy threatens to wipe the creatures, both good and bad, from the face of the earth forever.
First, let's look at the personalities of the two kaiju.
Godzilla:
Monarch describes Godzilla's behavior as that of a "protector," calling him an "ancient guardian of the natural world." While Monarch initially considered Godzilla to be a threat, it now considers him the potential greatest defender of the planet, as he emerges to battle any aggressors which threaten the balance of nature. Whenever Godzilla is not enraged and in combat, Monarch describes him as "slow, graceful, inquisitive even."
Godzilla (2014), Godzilla's behavior seemed to be that of a territorial animal. Ishiro Serizawa theorized Godzilla is the driving force to restore balance to nature whenever that balance is disrupted, suggesting that he essentially considered the entire Earth to be his territory. However, unlike previous incarnations, he doesn't blatantly attack or plow through ships at sea simply because they are there. In fact, with larger ships like aircraft carriers, he simply dives down under them.
(Though what happened to the U.S.S. Lawton may have been an unintentional act from Godzilla whether or not if he was the one who did it).
Even when he was attacked by the military, he didn't noticeably react or fight back and simply continued to hunt the MUTOs, even when being followed in close proximity by four naval ships. He only reacted by this when they shot him in the gills and he ran through a part of the golden gate bridge, showing it wasn't an intentional act of destruction, rather him just responding to his weak spot being hit.
He showed little interest in humans, instead focusing his attention entirely on the MUTOs. After defeating both MUTOs, he left the humans alone without any more conflict. In Godzilla: Aftershock and Godzilla: King of the Monsters, Godzilla continued to behave in this manner. He maintained a patrol route around his territory, and used his glowing dorsal plates to perform an intimidation display. While Monarch initially assumed Godzilla was demonstrating aggression toward them, they later realized he was reacting to the presence of the ORCA before pursuing it to Antarctica. Godzilla recognized the threat posed by his ancient nemesis, King Ghidorah and goes out of his way to seek out and try to defeat Ghidorah on three occasions. Godzilla recognized Mothra as his ally and communicated with her through sonar. He demonstrated inquisitiveness toward humans, first when he saw Serizawa approaching him and placing his hand on his face, and later after he resurfaced and leaned forward to inspect Mark Russell. Godzilla never demonstrated outright hostility toward humans when he noticed them, and allowed himself to be surrounded by a full military escort when he headed to Boston to confront Ghidorah. As the new alpha of the Titans, Godzilla was said to actively steer other Titans away from human cities and prevent any further destruction.
