I know this is super old, but I just came across it and felt I may be able to shed some light on why Aquaman is so strong and so fast compared to other Atlanteans while only being half Atlantean himself. Being cross bred Aquaman potentially benefits from something called heterosis, also called hybrid vigor. Now it is only considered hybrid vigor if the offsprings traits are enhanced as a result of mixing the genetic contributions of its parents. This doesn't always work in linear ways that are easily predicted. While I wouldn't consider a liger's size to be a good thing for it, it is bigger than either of its parent species the Lion and tiger. This is because male lion genes (it is only a liger when the father is a lion and the mother is a tiger, otherwise it is a tigon, and yes they are different) are designed to encourage rapid growth in it's offspring so that they can grow rapidly to compete within a pride where multiple males may have fertilized the females of the pride. Female lions actually have genes to try and prevent their cubs from growing too rapidly and potentially overpowering other offspring in the pride, since Tigers are mostly solitary this isn't an issue and as such the females don't have a restrictive gene that hinders the male lions genes that push for the offspring to get big and powerful so liger's wind up being huge, larger than either species. So ultimately there may be something in human genes which unchains the genes which cause Atlanteans to be superhuman and allows someone like Aquaman to vastly surpass either genetic heritage from which he originates.
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