A strange ask, for each God if you would humor me.
To khorne: how would you feel about a warrior who is both weak and strong? Unable to stand most days, but able to endure the pain of it anyways. Able to rip themself apart to get to a fight they know they can't handle, solely because they know no one else is close enough to fight. A warrior who only ever sheds blood from the cruel, but more often than not, sheds his own blood as a shield or to sacrifice and be food.
To slaanesh: how would you feel about a person who cannot find pleasure in anything for long? A person who is terrified of being happy, and cannot even have the simple pleasure of stale bread without feeling like a monster who deserves to die for not sharing, when really they deserve the world. A person, who has only had pain, torture, and despair in excess... a person so terrified of being happy or comfortable, they think the world will end if they ever love.
To Tzeentch: how would you feel about someone who has done everything to make a change, a difference, only for it literally to blow up in their face horrificly. A person who has started an endless cycle of death and destruction, because every opportunity in their life is either fake, ripped away, or they fear it... not out of coweredance, but genuine terror that has been conditioned from all the terrible failures that they are convinced are all their fault.
To nurgle: how would you feel about a child growing up, abandoned by their God, feeling undeserving of love? Not even a second into life, this hypothetical child already has experienced the worst of pains and losses. Everything in this child's life methodically burned away, and they are blamed for it. Growing up, raising not only themself, but a planet's worth of others who are all younger than them. Every life they ever loved, forcefully taken by their God, to where they wonder if loving anyone is a sin... a poor child, surrounded by so much suffering and death, with bodies of their loved ones piling miles high, unable to decay, as a reminder for what happens when you betray a god.
And after each of you have processed each hypothetical person: how would you all feel if this was the same demon? All just one tragic being, that none of you can even influence. Not because they're protected, no... because they're too hurt to trust any of you.
" There is value in gameness. But only so much in the absence of strength. This being sounds loathsome and their terror would taint my armies. I would sooner have their head than entertain them. "
" Sensation encompasses pain and suffering as much as pleasure and delight. The person serves my purposes, their terror and misery a draught. They do not need to trust me to serve, to worship me for me to get what I want."
Tzeentch does not appear to be present. The question goes unanswered, not that the Changer would've been truthful or forthright even if he were around.
"Why, that child is one of my very own, even if they do not know it! To be touched so early by despair, the fates have deemed them for me. I will shield them in a bodice of mouldering flesh and twisted bone, dead nerves and deliver upon them a delight based in resignation to to the end. I am a patient god, willing to build trust with this hypothetical daemon. Time weathers all barrier."