Rui and Muzan: Similar but Different
The fact that season one ends conflict-wise with Tanjiro vs. Rui is actually really interesting, especially when you consider that Rui is Lower Moon Five but is considered one of Muzan’s “favorites” (mentioned by one of the spider sisters), and we actually had that set up as fact by Tamayo’s confrontation with the Temari Demon:
Rui’s Spider Family has -five- members, and we learn that they aren’t his blood relatives, but other demons that he “took in” as his “family members”. And when you look at Rui and Muzan, once we learn about Muzan’s origins, it’s actually not that surprising that Rui got such special status despite his rank. Out of all the demons we’ve seen Muzan create, Rui’s human situation is the closest to Muzan’s origins. Both of them were born with very sick and frail human bodies, and both had a strong desire to live in spite of their poor health. What’s even more interesting though is once Rui becomes a demon, he is even more like Muzan. All the way down to threats and posturing. Such as how they posture in these two scenes:
When Tanjiro first runs into Rui, the Spider demon warns him that:
Muzan also did this in Volume 2 in the alley:
Up until this point no other demon that was actively under Muzan has given anyone, especially humans warnings or a chance to walk away before killing or harming them. And in both instances they were dealing with an incident and feelings of rage that made them even more short tempered but they still offered the alternative to the interloper. Muzan was dealing with his sudden PTSD of seeing Yoriichi’s earrings, and Rui was dealing with Sister Spider Demon not “properly fulfilling her role.” In both cases what they were dealing with took priority over the annoying humans who came upon them and they were originally willing to ignore the interloper. Even in dealing with the demons beneath their command they exhibit similar behavior, both of them use fear and violence to intimidate the demons around them and to get them to do as they say.
Rui says this after we had just witnessed him slicing up Spider Sister’s face for making a mistake and him telling her to shut up, cutting her head off so hard that it not only threw her severed body back but his webs hit the tree behind them. Even if Tanjiro hadn’t pointed out that he could smell the fear and contempt we can see it because the actions Rui just did show that he is using fear and violence to control his Spider Family.
The instant the Lower Moons realize that’s Muzan (except Enmu?) they’re sweating bullets and scrambling to appease him, he then proceeds to eat one of them after putting them in a “damned if you do, damned if you don’t” situation. Interestingly this is also where one of their differences lies, Rui is willing to grant Spider Demon Family members at least one more real opportunity and sometimes more, as we see with Spider Mother and Spider Elder Sister. Whereas Muzan is typically much quicker to just straight up kill them, Rui believes he is showing mercy and sustaining a relationship whereas Muzan feels no connection or relationship with his demons on any level besides Master-Servant.
Rui and Muzan are also similar in the shared belief that “If you don’t/can’t fulfill your role then you should die”. Muzan wipes out the Lower Moons because they didn’t fulfill their roles of becoming stronger and killing the Demon Slayers, and Rui decides to kill Tanjiro when he refuses to “accept his role” of giving his sister over to Rui. What’s interesting about this connection between them though is that it’s also where their original difference lies. Muzan has never understood the importance of bonds, of connection and love and relationships but Rui did and had it. When Rui realizes that his relationship with his parents had been genuine, that they had loved him and were “fulfilling their roles” as his parents, he felt so much guilt that he suppressed it and then spent the rest of his demon life trying to recapture those bonds and feelings even though at that point he was convinced his parents were imposters. He did everything in his power as a demon to recreate the very thing that Muzan doesn’t understand and abhorrently rejects. And even though Rui no longer understood the true meaning of relationships and their importance beyond what family members do in their “traditional roles” he still attempted to recreate it instead of scorning it like Muzan does, Rui believed that he had a strong bond with this found family and was desperately trying to rediscover that human aspect of himself even though he wasn’t aware of it. Its fascinating that even one of Muzan’s “favorites” as a demon knew that relationships were and are important and tried to reclaim it through a demon family and that Muzan never even batted an eye at him doing this.