Lion El'Johnson: look at the child, look atvthe figure, hands the child to a watcher. The someone will be found in a few hours and questioned. They are clearly not a fitting parent, the child is now on the schedule to be an astarte.
Fulgrim: panic, more panic and also abit more of panic. What's happening? A child?! Why they are giving him the child?!
"Stop looking at me with those big eyes!...those very...very cute...eyes..."
He's a single mom dad now.
Perturabo: drop the child to the serfs, he have no time for this...no he haven't build a nursery...no those aren't toys, stop making questions.
Jaghatai Khan: "...Well! It is what it is!"
Put the child in a baby carrier while on his bike, actually taking everywhere with him. He's kinda fine with it.
Leman Russ: he was drunk whennit happened. Now he's sober and with a baby that doesn't want to stop to scream. He'll tey to search for the parents or a suitable family amd if no one is a fit candidate he's already planning to teach him how to use the sword.
Rogal Dorn: confusion, everything had happened so fast that is Sigismund the first one to react. When order is restored, hehave to make decisione. Their caretaker had abbandoned them, leaving them with him, a Primarch and Terra Praetorian. He can do it, his grandfather dis it with him, si he can...maybe he'll need a possible mother too...
Konrad Curze: ...what?...why?...are you nuts?...why him? Of everyone WHY HIM? ...the parents are already dead, they are clearly unfit for the role. The child? To a new family, far more prepared and accepting.
Sanguinius : clearly there must be a misunderstanding! They'll be back in an instant!...then hours pass...they are nor coking back, eh little one? He should let them to a more fitting parent but...but they look so innocent and...so cute...and....ok they are his xhild now, back off ((goose hissing sound)).
Ferrus manus: straight back to the tribe that had TRIED to pull this stunt on him.
Angron: you want that baby dead? Kharn had akready snatched it from the Primarch hands before he could kill them. The baby go straight to an orphanage, a nice place where they can grow healthy and strong.
Roboute Guilliman:
Theoretical: they entrusted their offspring to a more competent individual.
Practical: this is a sign of a deep problematic issue in the growth of natality.
Yes, he need to focus on something else to receive the recent events. The child will stay in the care of the Fortress of Hera, all while GUillman start to questioning the state of the child support on the Imperium.
Mortarion: he doesn't understand whl i. Their right mind would left their child with him?! He's not suitable for this job! He'll search for someone else...then no one is good enough. He'll end up as a single father in a few weeks, he already like the child.
Magnus : what an interesting surprise! Surely this is was absolutely unexpected! He's absurdly okay with this news, he see only the nice part of it. He can teach to everything he know to a young mind and soul! He'll make sure they are always hungry for knowledge! Present himself to the meetings wirh the child in hia arms.
Horus Lupercal : he just look around, holding the baby, rising it up so the parents can see them and take care of them. Actually rise his voice to call their attention, but when no one came he just look at this creature and just go "Oh shit." He try to look uncomfortable, sad even...but secretly he's estatic. He always wanted to have a baby, now he can finally be a father! Yes, this is a sign! Now he only need a fitting queen!
Lorgar: he just present himself to Kor Phaeron with the baby in his arms. "They left them..." with the most calm yet stressed voice. His step father told him to get rid of them, to gave them to someone else...but this is a sign! Something sent to him by his father! An heir to spread the word of his teaching! He'll fuck up good this baby...
Vulkan: he's stressed, why did they left them? Something bad was happening? They couldn't provide for them? Maybe, or maybe worst. He want to meet the parents, maybe he can help them so they don't have to abandon their offspring. And if they don't want help...then he'll rose them just like his sons, he won't abandon this creature in need.
Corvus Corax: he's note concerned of the fact that they actually found him...then he have a baby in his arms...oh..ooooh nooo they can't entrust him that much! He is not capable to take care of a child! He'll panic, then try to search for the parents, then panic again. He'll ask Vulkan and...well he could try to rise them? Like the slaves did with him?...he's not sure of the results.
Alpharius/Omegon: ah....ah ok...let's send the baby to the recruits, let's make another another member for the legion.