The Leviathan Kaiju lives on a remote giant planet made entirely of stone and minerals.
The planet is devoid of life and since about the start of human kind, the Leviathan Kaiju species has in approaching extinction.
Only one exemplar remains.
Leviathan Kaiju's are much bigger than most Kaiju's, measuring 14987 meters from head to tail and measuring 8365 meters in height(not counting the spikes on it's back).
They are carnivorous but can also digest dirt and a few types of minerals.
Being so big needs a lot of food, but since their planet is devoid of any life, they have to travel to other planets to eat.
They do so by flying using some weird magic, I guess.
Since they are so big, they need to eat other Kaiju to survive.
The last time the Leviathan Kaiju has eaten was 364 years ago.
The Leviathan Kaiju does have a predator role in the Kaiju hierarchy but respects other predators that are much more important then them.
But they eat predators that aren't important or highly respected, because basically nothing is big enough to be the Leviathan Kaiju's predator.