What if tanjiro got the carnage symbiote?

Entertainment district

The four arrive at a city in Tokyo.It is known as "the entertainment district".

It's a lively place,full of customers,servers,and many other kinds of people.The two walk around until they find a group of ladies.
Lady 1:Hey now,you boys look friendly.
Lady 2:Want to come be with us?
Lady 3:We have candy,and so much more.
Zenitsu blushes as inosuke just curiously stares,tanjiro grabs their hands and walks away.The three continue to journey through the district until they hear a familiar voice.
???:Well well.
The three look to their right to see-

Tengen:I didn't think I'd see you again so soon.
Tanjiro:What are you doing here?
Tengen:Simple demon slayer business.What about you?
Tanjiro:...
Tanjiro begins to walk away,Zenitsu and Insouke are about to follow when Tengen calls out.
Tengen:Wait!Maybe we can help each other.
Tanjiro stops dead in his tracks,and Tengen starts to hate himself.
Tanjiro:Help?
Tanjiro looks back with disdain and anger.He begins to turn his whole body as Tengen begins to sweat.
Tanjiro:You try to force a little girl to come to a place like this,say it's a mission,throw a bomb at me,and now you want my help?!
Tanjiro turns around entirely as tension overcomes Tengen.Maybe he shouldn't have called out.Tanjiro takes a deep breath and controls himself.
Tanjiro:...What do you need?
Tengen smiles in relief.He brings them into a house that he rented and explains the situation.
Tengen:I heard of a demon here in the entertainment district in Tokyo.I sent my three wives here to check it out,but they've been silent for at least 2 weeks.
Zenitsu:Wait...you have THREE WIVES?!?!
Zenitsu goes into a wild rage,flapping his arms about and getting in tengen's face.
Zenitsu:That's impossible!A crime!A crime against humanity!How could YOU have gotten three fine ladies to marry you?!
Tengen:Are you trying to say something?!Is there something about me that makes that unbelievable?!
Tengen and Zenitsu argue at each other.
Tanjiro palms him face as Rui rubs his back. Suddenly,Insouke stands up and tackles Zenitsu and Tengen.
Tengen:HEY!
Zenitsu:What are you doing?!
Insouke:Stop messing around you losers!We need to help my subordinate!
Rui stands up amidst the chaos.He slams his foot down and makes the three freeze in their steps.He then speaks.
Rui:I can find them.
The group looks to Rui in curiousness.
Rui:I can sense my fellow demons,we can find them,defeat them,and make them tell us where your wives are.
Tengen:And how do we know that they'll talk?
Tanjiro:They will.
Tengen:Oh,right,you're here.
Tanjiro:Do you sense the demon now Rui?
Rui:Yes master.I think they're in one of the large buildings.
Tanjiro:Alright then.
Tanjiro stands up and begins to walk out.
Tengen:Wait,you're just heading over there?!
Tanjiro:Yes.Will you be coming with?
Insouke and Zenitsu come to his side as Tengen just watched them leave in surprise.Are they really so confident that they'll just approach the demon head on?Tengen stands up and follows,but from a far distance.He has to see how this ends,but won't needlessly risk himself.The two arrive at the building.
Rui:The demon is at the top.
Tanjiro gets low and even puts his hands to the ground.
Tanjiro:Rui,grab Zenitsu and take him with us, Insouke,evacuate everyone nearby.
Insouke:Hey!Why do I have to evacuate?!
Tanjiro:Your the best at making people uncomfortable.
Insouke didn't know what that meant,but Tanjiro said he was the best at something so he'll prove him right!Insouke screams at the top of his lungs and starts swinging his arms at everyone,making everyone run away.As he does,tanjiro and Rui,who has Zenitsu close to him,take a large leap and get to the highest level of the building.They kick through the glass windows into the room.They see a woman holding a little girl up by her ear.The child was crying as he ear was literally about to come off. The woman seems to always have an aggressive expression on her face.
Aggressive woman:Who are you?!
Little girl:U-Uh...
Upon seeing the small girl in pain,Zenitsu dashes forth and grabs into the woman's arm. He was clenching it tightly and speaks in an aggressive tone.
Zenitsu:Let go of her ear,now.
Aggressive woman:Hmph!
The woman easily breaks from zenitsu's grip, she's about to attack when Rui kicks her in the stomach,launching her out of the building.
Little girl:Miss!
Tanjiro approaches the girl and kneels down,he speaks in a gentle voice.
Tanjiro:Listen,you need to go.Something very bad is about to happen here.If you see anyone else,you need to tell them to leave the premises.
Little girl:O-okay!
The girl looks to Zenitsu.
Little girl:Thank you!
Zenitsu just silently nods,he was serious. Zenitsu was actually a very powerful swordsman,but he gets so nervous that he just collapses and can only fight when he's unconscious and the nerves are gone.But now, his anger was enough to cloud out the fear.The only Oman leaps back into the building, confirming rui's finding.She was in an entirely different set of clothes,and had a more inhuman appearance.

Daki:Who are you ugly vermin!?
Zenitsu:Shut up and die.Thunder breathing first form,thunderclap and flash!
Zenitsu bursts at Daki,who uses her belts to try and block,but Zenitsu was so strong that he ended up tackling instead of cutting her when he drew his sword.Zenitsu pushes daki back out of the building and then drives her into the ground.
Rui:I had no idea he was so powerful.
Tanjiro:I did,I just didn't think he could tap into that kind of power while conscious.
Tanjiro and Rui jump out to see daki and Zenitsu clashing.Zenitsu was very skilled, slashing precisely and powerfully,daki starts to get pushed back until she simply leaps backwards.Tanjiro grabs his cleaver and clenches onto it,but suddenly,the cleaver turns red.Tanjiro isn't sure what's happened to it,and as such,there's nothing but one way to find out.Tanjiro lunges at daki and swings his massive cleaver,as it makes contact with Daki's flesh,it brightens and begins to actually burn daki's skin.
Daki:AAH!
Tanjiro swings through daki's chest and makes her bleed.Daki leaps back in pain,but as she flies through the air,Rui extends his hand and wraps Daki in webs.He pulls her towards himself and punches her in the heart, destroying it.Daki is sent rolling across the floor with a a bleeding chest.
Daki:Damn you!You ugly bastards!
Zenitsu lunges once more,but daki sends out a while volley of belts.Zenitsu isn't able to cut through the next one.Tanjiro takes a deep breath and empowers himself.
Tanjiro:Darkness breathing,sixth form.
The symbiote thinly covers Tanjiro as he suddenly fades away.Suddenly,Daki's head just falls off of her body and hits the ground.Tanjiro comes out of seemingly nowhere as the thin layer of symbiote sinks away.
Daki:What?!How'd you do that?!
Tanjiro:How are you still alive?Your body should have fades right now.Well that's actually good.Your going to tell us where the woman are,NOW.
Tanjiro kneels down as Daki is overcome with fear.She instantly spills the beans.
Daki:Th-they're all the way over to the west, just keep going form her rib that direction and you'll find them!
Tanjiro:Thank you.
Tanjiro raises his foot and stomps down on Daki's head,completely crushing it,but the body still remains.
Tanjiro:How is this happening?
Suddenly,the symbuote and Rui sense something actually powerful.Suddenly-

An entirely other being,a man,crawls out of daki's back.It comes out completely as tanjiro grips his cleaver with both hands.The man speaks in a strained voice.
???:Hey hey...

Gyutaro:What's going on here?
Gyutaro grabs Daki's headless body as it suddenly regrows a head.
Daki:Brother!
Gyutaro:Now now little sis,you shouldn't be getting yourself beaten up like that,since you have such a nice face.
Gyutaro turns back around to tanjiro.
Tanjiro:Your her brother?
Gyutaro:That's right,and you just beheaded her and smashed her beautiful face in,you've gotta pay for that.
Gyutaro approaches Tanjiro,as he does the symbiote unveils and covers Tanjiro's body and it begins to morph.Tanjiro grows and mutates until Gyutaro and him are face to face.
Carnage:Your the one who will pay.