I mean, the Chaos Gods do have "good" aspects, only they're a reflection of the galaxy and currently the galaxy is a real shitty place right now.
Personally I really like A Wolf In The Garden's portrayal of their good aspects.
Woke up from a nap, and I'm rotating Not Remotely Possible In Canon™️ warhammer ideas.
What if daemons could be "normal" somehow? I just randomly thought of chaos daemons doing good things that fit them, and it's probably gonna go on my long list of shit I wanna draw.
A bloodletter being a surgeon, and dedicating every drop spilled in the act of saving a life to khorne. Since he's honed his blade (the scalpel) he's known as the best surgeon in the world, making it high demand for him to do ANY surgery, no matter the risk. He has spilled more blood than any other daemon, despite not being on the battlefield often, and dedicated the skulls of organ donors with the highest respect in his own dark heart. Also GREAT advocate for patients, because he will threaten insurance companies and incompetent doctors with being a more traditional sacrifice to khorne. Using his rage to protect the health of his patients rather than destroy. He never gets stronger or any blessings from khorne due to his small but consistent sacrifices, but he does get praise from patients, and letters up until their deaths. He keeps track of the letters, and gives him a pat on the back when they stop at either a reasonable or surprisingly long number of years.
A Changer of Ways, that's a special ED teacher and tutor. Never once using the same way of education twice for each of his students. Manipulating fate to make sure his students get 100% for all their homework and tests. But he never let's his students cheat, always making sure they understand the material, even if they understand it at a different angle. All his students love and respect him more than any cultist he's worked with in the past, and he has entire tomes dedicated to his students art of him, with their pictures on one page and descriptions, his positive opinions, and various ramblings about the young artist on various other pages. When the mortal children reach adulthood, they are able to excel in whatever field they desire, even when their new teachers at college teach them differently than their beloved teacher Mr. Bird, because they merely study their own way and succeed no matter how their professors look at them. So many people say the children who become his students won't ever succeed in life for being "lazy" or physically unable to do their work. He teaches, not just for the love of the kids, but because he thinks it would be really fucking funny for these kids to succeed anyways.
A great unclean one whose a heretic, seeing past his warped view, and seeing how much mortals actually hate disease. While he doesn't understand why mortals don't want the grandfather's love, he actively finds different ways to share it, becoming an anthropologist to fully understand mankind. He runs experiments every now and again, to see what mortals truly willingly receive, and what they give into because of having no other choice. He spent years growing various types of fungus in random places to gauge and write down mortal reactions. Do they collect it to eat? Do they just kick it away in disgust, or with glee? Do they avoid it at all costs? Do they destroy it? It narrows down the species of mushrooms drastically, limiting the "love" he can show through decay, but at least the mortals are feeling the love now. He studies the reactions of humans during plagues caused by his brothers, and starts smaller epidemics of his own, being extremely controlled with how he infects his subjects. He learns while mortals technically NEED plagues, they don't want them all the time, so he starts epidemics in moderation. Making weaker brights and pox to study over the next several weeks, accidentally making mortals more resilient against plagues, which is something they WANT. While all daemons of nurgle "love" all life, this one Unclean One truly loves humanity, and loves them how they need.
A group of daemonettes who work in rehab to try and get mortals to overdo it, only to take great satisfaction in actually helping. They're the only ones who actually do the job right, and treat the people there as people. I could see them in the hospital with the bloodletter, under silent truce of "You don't fuck with MY job, or MY patients, we're fine." They relish in the torment silently whenever their patients are freaking out from withdrawals, then bask in the praise when their patients make a full recovery. They give "false comfort" to their patients when in reality its more comforting than an actual doctor or therapist, because they ironically don't demonize the addicts, since they themselves 100% have had worse.
Maybe he could also get into farming, making plagues to invasive insects so farmers don't need pesticides, or he could help food rot faster to make fertilizer. Hell, he could make his own manure, watching what he eats and doing that one attack on a field to spread it around.
Or maybe instead of working in rehab, they could clean houses for free, restoring the simple luxuries, before giving their clients excessive gifts to keep them on their feet. Food in their clean fridges, expensive shampoos and cleaning products, beautiful decorations, and whatever else their client needs. Hell, maybe these could be daemonette groups that work together, restoring the homes of ex-addicts so they have some place more than just livable to return to.
It's fun thinking of chaos daemons doing "good" on purpose, both in the sense they would never logically do that, but also the stank eyes they would probably get from more traditional daemons.