I'd figure them to be fairly autistic in their attitudes. They have a stunted social interaction and are results driven. They are one of a few to be chosen, one of even fewer to survive the process, and even less to survive the horrors of combat. They are worshipped as heroes across the imperoum, probably with action figures or similar, and are seen as literal angels of the Emperor.
They outclass anything human, where they have been shown to chase speeding vehicles, and withstand immensely powerful weaponry - autocannon rounds are often likened to 40mm shells, while stubbers are 50 cal guns, their basoc weaponry being more powerful than what is considered the heaviest machine gun in modern era weaponry which is already capable of destroying the bodies of those it hits, and is something that is only normally mounted on a vehicle.
They can carry and serve their own heavy weapon system - including aforementioned 40mm autocannons or full calibre explosive rocket launchers. They are pretty much a walking medium tank in todays terms.
They do not get PTSD
They do not have family.
They do not have friends.
Their weekend off is not a few beers down the pub woth some matea from school days.
They are uniquely engineered killing machines, designed to go against the literal demons, and face down Orks which can be oitweigh a human by around 3:1 in hand to hand, fight tyranids whose reactions are near light speed and can peel open battle tank armour like a packet of crisps, and win then do the same again. And again.
They are desogned to enter a battlefield from a positio in low orbit, not only survove the ground shattering impact, but exit the drop pod before it is destroyed by heavy weapons, and fight. They have eodetic memories and access to some of the most advanced battle intelligence ever conceived, filter all that information as it comes up on their HUD, enact on it, and utilise all of its abilities during the middle of combat.
It must be like trying to pick out a moving target on a video game where ypu are trying to factor in things like bullet drop, coriolis effect, wind deviance, while avoiding hitting friendlies in the crowd he is dpdging through, as ypur little brother is starting a pillow fight, you are attempting to revise for next weeks test and keep an eye on next doors dog which is taking a shit on your lawn. A near physical impossibility for us, and yet something of that complexity is an Astartes bread and butter.
There is nothing that even fellow elites like Scions can remotely empathise with or bond with on a more even level than they are good soldiers.
If you have ever read the book the 'curious case about the dog in the garden' which details a boys struggles with aspergers, I feel that is simiar to how an Astartes should be with others.
When it is arpund people it is comfortable with, then it is fine, the awkwardess goes, and they become more normal. Hell it is hard for todays soldiers to relate to their families the hell of what happened in Afghanistan, and those who fought during The world wars is a horror not many can live with.
Hell, on my last tour in ghanners, we took a psychiatrix test on our return. 17 out of the 26 in the unit were defined as sociopaths, woth personality traits matching Lord Voldemort, Sauron and Emperor Palpatine on the little sheets they gave us. The other 9 were various, but they certainly weren't harry/frodo/luke, aragorn/han/dumbledore. We're essentially fucked up - and then amplify that a thousand times.
Literal warrior monks. Nearest analogy is probably Shaolin monks or crossed woth Terminators.
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