Making him have a roidhead body is modern influence, Orion was never depicted as being particularly strong or muscular, like others like Herakles actually were, because you needed a lot of stamina to hunt in the age of bows and spears, a bulky body is a hindrance in that setting, it only works in Hollywood movies.
And those like Herakles were depicted only with what's naturally achievable, they couldn't know of steroids results, which is what the Eternum MC has. This was a peak strong body in Hellenic/Roman times, as an adult (not as a teenager like the Eternum MC is):
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If Caribdis is so into Hellenic mythology, he could have him have this body instead and it would be more in line with that age. But his body is what's only possible with modern steroids, it's a modern depiction of what's considered a peak strong body now but not even with suicidal doses of modern steroids can you have a body like that below 20.
Of course you can depict Jesus Christ or Siddhartha Gautama with roided bodies (it has been done already), but it's not what they were ever characterised as, in any form whatsoever were they depicted as having strong bodies.