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leviathans are huge creatures. they are often the apex predictor in there ecosystem. meaning they are usually the largest and the most dangerous this is shown through there design. often with parts that are very specific to there environment and hunting although not all are preditors. some whales can be seen as leviathans.
one example of peaceful is the reefback from subnautica, whilst still an unsettling creature. it can be compared more to the whales we have.
the leviathans from pacific rim. also known as kaiju are a good example of being designed for hunting. each kaiju is adapted differently.