There are moderate scenes of violence throughout. This is including both monsters and humans.
There are many deaths, some implied as large parts of cites are destroyed, but all lack blood or gore.
A man is electrocuted and passes out.
Several monsters fight each other in several scenes throughout the film, which sometimes includes humans participating as well with plans and bombs. Biting, scratching, punching and per the trailer, Kong has an ax now and uses it.
People run from monsters and some people are attacked by monsters and killed.
A few people are held at gunpoint and threatened.
Godzilla dislocates Kongs shoulder, the arm can be heard cracking and breaking.
Kong eats a handful of fish, blood is shown on his teeth.
Godzilla slashes Kong's chest repeatedly you can see the numerous non-bloody scars as he does it to Kong.
Kong stabs Godzilla in the leg with his axe leaving a bloody wound, Kong later punches Godzilla's stab wound causing Godzilla to roar out in pain.
Warbats' attack Kong and one knocks a flying vehicle out of the sky, Kong fights the creatures and one wraps its long tail and large wing around him until it is shot by someone in a flying vehicle and it releases Kong; Kong then slams it to the ground, pounds on it and tears its head off (we see slimy goo and tendrils as Kong eats from the creature's head).
Some blood, a character has blood on his mouth and is injured in a pile of rubble, godzilla and kong mash ups are big and cause injuries, there is one scene were a creature is killed and a bunch of green blood comes slamming on a window