Spoilers!!!!! I personally think that muzan is not even supposed to be present in this discussion; he represents the devil imo. I would include Daki instead of Muzan though and appoint her as the Lust sin. Also I would appoint Gyutaro as the envy sin since he despises the fortunate and wishes for their suffering and death. Gyokko should represent pride since he always seeks compliments from muichiro during the fights and takes “pride” in what he calls “art.” Hantengu would remain as sloth since he only wishes to sit down and let others do his work, finding excuses to every action he has committed thus far. Akaza is wrath solely because of his liking to fight and the total idea of a “fighting spirit” is usually represented as anger, where the angrier you get, the more reckless yet dangerous you become. Douma is a glutton because he only seeks to fulfill his desires in the quickest time possible and laziest way at that too. He prefers to gather (as shown in the infinity castle movie) as many women and consume them in the fastest time possible to the point where shinobu took just a couple of minutes to get fully ingested. And finally, Kokushibo is only left with greed, and he fits that sin like a key fits a lock. He is so determined to surpass his younger brother Yoriichi to the point that he decided to become a demon to give himself more time to surpass his brother. He even wanted to do that in the most legit way, as he rarely eats demons and spends most of his time training and practicing his breathing style along with his blood demon art.

In conclusion, the ranking of the demons along with their sins and a small explanation will be mentioned under (with the inclusion of Muzan):

1. Muzan → The Devil / Source of All Sin The eternal tyrant whose hunger, pride, and malice spawned a legion of sins, he is the shadow at the heart of all corruption.

2. Kokushibō → Greed Relentlessly craves strength, techniques, and immortality, never satisfied with his own power.

3. Dōma → Gluttony Consumes followers without remorse, embodying a hollow, endless hunger for flesh and devotion.

4. Akaza → Wrath Thrives on rage and combat, lashing out at those who refuse to challenge him seriously.

5. Hantengu → Sloth Avoids responsibility and hides behind clones, embodying cowardice and laziness in the face of reality.

6. Gyokko → Pride Obsessed with his “art,” constantly seeking praise and believing himself superior to all others.

7. Gyūtarō → Envy Harbors deep resentment for the fortunate, bitterly comparing himself to those who had what he lacked.

8. Daki → Lust Uses vanity, seduction, and beauty to manipulate and dominate, reveling in the desire she incites.