Top 10 Biggest Flexes in Demon Slayer

#10: Muzan’s Main Street Murder
Most demons are loud and proud about their death tally. But, then again, Muzan Kibutsuji isn’t “most demons.” As the original monster, Muzan doesn’t concern himself with the small fry like Tanjiro. Instead, when he comes face to face with the slayer in the middle of a busy street, Muzan simply slashes someone's neck. It happens in the blink of an eye, and before anyone can notice, Muzan has already slipped away. We know that Muzan is powerful enough to kill any human on sight, but turning them into a demon in the middle of a packed street without getting caught is something else entirely. If this is what Muzan can do undercover, there’s no telling what’ll happen when he gets serious.
#9: Bugging Out
Shinobu may look friendly, but trust us, she’s a Hashira for a reason. Case in point; her friendship with the conniving Spider Sister begins and ends in the span of a single sword slash. Of course, Shinobu’s no monster. She gives the demon plenty of options for penance. Like, say, gouging out her eyes, or losing some of her organs. She chooses the hard way though, so Shinobu has no choice but to bring out the butterflies. Spoiler - they aren’t as harmless as they seem. The poor Spider Sister never stood a chance against this poison. Clearly, when Shinobu says she wants to be friends, it’s best to start running the other way.
#8: Organ-ic Victory
A few stab wounds won’t keep this boar down. Although, we can see why Daki was confused. Gyutaro’s attacks would have sliced any other Slayer into finger food. But, Inosuke has a trick up his sleeve; he can literally rearrange his organs at will. Including his heart. The battle implications are insane. Unless you mince him into dust, Inosuke can almost never be fatally wounded. We’d say Daki and Gyutaro won’t make that mistake again, but based on how Inosuke cleaned up this fight, we’d wager they won’t be doing much of anything at all, anymore.
#7: An Emotional Final Form
Sniveling wimp or not, there’s a good reason to be scared of Hantengu - four, to be precise. When the going gets tough, he splits off into a squad of demons each representing the emotions of Joy, Sorrow, Anger, and Pleasure. Together, they smacked around Tanjiro, Nezuko, and Genya like nobody’s business. But, with their main body at risk, they decided to up the ante and show off their real strength. Also known as Zohakuten. While Hantengu was in danger, Zohakuten’s arrival felt like overkill. Based on how quickly he thrashed the main cast, Hantengu’s original emotions could have probably handled this on their own. Evidently, restraint isn’t one of his virtues.
#6: Muzan’s Not Mad, He’s Just Disappointed
Shortly after slaying the Flame Hashira in cold blood, Upper Rank demon Akaza was probably feeling mighty full of himself. However, Muzan wasn’t impressed with his subordinate’s cockiness, especially once he learned Akaza failed to kill the other three slayers at the scene. So, like any good father figure, Muzan doled out some tough love. All you need to know is that Akaza’s smirk vanishes in record time. Keep in mind, he still murdered a Hashira, and that’s no small feat. But, despite it all, Muzan doesn’t pass up the opportunity to assert dominance. It’s a good thing Akaza beat Rengoku at all, else he might not have walked away from this check-in.
#5: A Swordsmith’s Duty
Not even Kizuki can get between a swordsmith and their work. During Gyokko’s attack on the blacksmith village, Haganezuka decides he’s going to finish crafting his sword, and nothing, demon or otherwise, will stand in his way. Gyokko doesn’t make it easy on him. But, Haganezuka doesn’t so much as turn around, even when the demon starts lashing his back. Haganezuka doesn't stop when his mask gets blown off, when he’s hit in the eye, or as the entire building explodes around him. Now that’s some dedicated workmanship - not to mention a smack in the face to Gyokko’s so-called strength.
#4: Demons on Demons on Demons
Upper Ranks just don’t know how to leave well enough alone, do they? And, to think, it all started with Doma putting a hand on his allies shoulder. He failed to realize that Akaza doesn't like to be touched. When Douma doesn't back down, he finds himself without a jaw. Not that he seems too bothered by it. ALthough, if we could regenerate as fast as him, we wouldn’t mind, either. Later, Akaza tries again by taking Doma’s whole head. But, all it does is lose Akaza his hand and his pride, courtesy of an appearance by Upper One, Kokushibo. Moral of the story; don’t tick off a demon.
#3: Nezuko Goes Full Blast
Demons, everywhere, be warned: If you mess with Tanjiro, you have Nezuko to speak to. Daki pushed her luck too far, and Tanjiro’s sister positively snapped. We’re talking growing a full horn, biting off her muzzle, and developing a sick new kind of bloodlust. On the bright side, Nezuko used the power to kick the absolute crap out of Daki. Considering the Upper Rank had just swept the floor with the Slayers, Nezuko’s one-sided beatdown is a true, blood-stained sight to behold. The message was loud and clear; there’s only one demon who’s king of the Entertainment District, and her name is Nezuko.
#2: The Water Hashira In Action
In a hard-fought struggle for their very lives, Tanjiro and Nezuko had to give everything they had just to stay standing against Rui. And then, after all that, Giyu swoops in and slashes the demon’s neck in one, clean slice. Just like that. We’d say it’s unnecessary, but this is the same Hashira who sliced the Spider Father to bits without so much as a blink. One-shots are just Giyu’s thing. What’s more, he doesn’t even look all that impressed with himself. It’s one thing to slay a Kizuki in one strike, but another entirely to do it with a straight face. It makes you wonder, what does impress Giyu anymore?
#1: Infinity Castle Massacre
Muzan doesn’t take failure well, especially by his Twelve Kizuki. So, when they keep routinely failing him, he makes the completely rational and level-headed choice to clean house. To sum it up, Infinity Castle becomes a bloodbath. The Lower Moons? Gone. Every single one is left on the cutting room floor. These are supposed to be the best of the best, and Muzan takes them all out within minutes. As if to prove their ruler’s might, some of the Lower Moons don’t even put up a fight. For example, Enmu, who knows resisting Muzan is pointless. With that kind of reputation, it’s no wonder Muzan reigns supreme.
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