Tmc Au - Blog Posts

I paid @fungal-waste 5 dollars to make this for me and I’m so happy he did because this is literally ANAP O’Brien

I've been going a LITTLE bit insane over @psiioniicarts Alternates in Arms AU so I did a fanart :3

I hope it's good! I did my best with the hands

Finally finished the art for the TMC x KNY au. It's only the main four victim's, but I plan on doing the rest eventually.

Here's the picture without the layer's on top.

Quick overview of each character's breathing styles (minus Cesar since he's a demon in this au):

Mark - Water Breathing (He is our Tanjiro stand-in so this is par for the course.)

Adam - Serpent Breathing (I, honest to god, had no idea what to do with him. While he is sort of the Inosuke stand-in, I wanted to diverge a bit from that, more or less. So, I didn't give him Inosuke's breathing style and gave him this one instead. It mostly had to do with the lore behind Adam's name; you know, the snake in the tree of knowledge. I thought it was clever.)

Jonah - Thunder Breathing (Naturally, I had to make him the Zenitsu of the au.)

OK, so I've been holding it off for a while (mostly because I wanted to make art for this, but due to circumstances I can't put the original pieces and I'm still working on the new one's), but I feel like you deserve some context on that Mandela Catalogue x Demon Slayer au I've had laying around so he we go.

This au follow's a lot of beats in KNY, but with Mandela character's + some oc's plastered on with a few small changes. I wrote a whole explanation on the Lore, but it's long as hell so I'll try to simplify it as much as I can:

(Quick context: Mark started living with Cesar and Mrs Torres after his mother left and his father died. She like's to help out whenever she can, feeling like she owes them. Also, don't think about the location/time period too much, I didn't really think through it.)

During a harsh winter, Mrs Torres get's sick and Cesar stay's home to take care of her, asking Mark to get some medicine after selling the coal. Not being one to refuse his friend, Mark agrees and head's down the mountain to the village of Mandela. After finishing her round's, Mark get's the medicine Cesar needed and make's her way back up the mountain.

It was getting dark and a storm was picking up. Halfway up the mountain, Mark is stopped by Noah (an oc/young father whose family live's close to the Torres')who warn's her about the storm and demon's coming out during the night. Noah insists that Mark stay the night with his family, who are just about to have dinner, and despite his initial refusal, the younger boy join's them for the night.

After that, Noah give's Mark the basic explanation that Tanjiro got about demon's and demon slayer's, you know the drill. Poor thing goes to sleep scared that night.

The next morning, Mark continues his way up the mountain with more speed than he did yesterday. He finally approaches the Torres house when the smell of blood suddenly fill's his senses. Scared, she quickly grab's a hatchet from outside and carefully make's her way to the front door. When she open's it, she see's Cesar's bloodied body pressed against his mother's, a pool of blood right under her. This, naturally, scare's the hell out of Mark and he immediately check's on the two. Mrs Torres, unfortunately, wasn't breathing, but somehow Cesar still had a pulse. Mark was relieved to know that her best friend survived and quickly slung him over her shoulder's in order to get him help.

While running down the mountain, Cesar slowly start's to come into consciousness. Mark tries to reassure his friend that they'll get help for his wounds, but the half dead boy just growl's instead of saying anything. Suddenly, Cesar freak's out causing Mark to lose his balance and the two fall off the cliff they were near. Thankfully, with a mix of snow and anime bullshit, the two survive the fall almost completely unscathed.

Mark, still a bit panicked from the fall, tries to find Cesar only to see him standing perfe tly fine. She ask's him if he's hurt when he suddenly lunges straight at her. Confused, Mark tries to reason with Cesar, but all he get's is a slew of incoherent growling.

Wouldn't ya know, Cesar had been turned into a demon!

Some emotional scene's later, the two are suddenly ambushed by a demon slayer, who is none other than Thatcher Davis, him freaking self!

Thatcher, being a demon slayer, is responsible for putting Cesar out of his misery, but Mark isn't going to let his friend die that easily, regardless of him being a demon or not. She decide's that she will become a demon slayer herself, kill whoever did this to Cesar, and cure him.

While Thatcher is impressed by her determination, he isn't just gonna let a demon go because of a probably empty promise. The two human's get in a fight that end's with the older of the two knocking the other out. Thatcher tries to get back to killing the demon, but Cesar manage's to escape in the struggle and sneak attack's the man. Then, seeing Mark unconscious, he run's right to him and just before Thatcher can pull out his blade….Cesar stand's protectively in front of his friend. This is what finally convinces Thatcher to give the kid a chance.

Mark wake's up to find Cesar unconscious and gagged right next to him. Thatcher explain's that he (Cesar) will need to stay out of the sun and must wear the mouthpiece in order to prevent him from eating any human's. He then leaves the two, but not before giving them a note to meet with the water hashira in the mountain's, who will help Mark in her training.

And that's the plot! There are other character's here, of course, but wanted to start with the first episode's plot and work my way up (I don't watch much demon slayer), so this is all you're getting. Still, I hope you like my au! I will eventually post some designs (maybe even some scene edits or whatever they're called), but that will have to wait!

Listen, I had a funny little thought:

Mandela Swap Au...but Cesar isn't fucking around.

Please do not pay attention to the anatomy (especially Mark and Cesar's 'paw's'). Don't mind the random images I placed on the wall's, it's been a long day. Hope you enjoy my catified designs (my favorite's have to be Mark and Cesar) and this silly little idea.

I almost forgot about this. Should probably explain this at some point.

Made some art for a Mandela Au idea I had. Idk, just thought it'd be fun. I'll probably post more info/stuff about it when I get to it or if I even feel like it at all. Either way, take my offering.

Here's the original image for reference or for any who was just curious:

Anyway, I hope y'all have a good christmas. I'm tired from crying at least four time's (pls don't ask), but merry christmas either way!

In AiA, does Mark ever find out that Cesar is an alternate? If he does, how does he react? Does he accept the knowledge (possibly after freaking out) and live with it or does he lose his mind/sanity and do something drastic?

There is one time he finds out about Cesar’s true nature, but his memory of that night is damaged and he doesn’t remember finding out. Alt Cesar manages to lie to him for several years longer about it, and Mark is none the wiser. After all, an alternate wouldn’t save his life, would he?

…

…would he?

Oh my god, I just realised how TINY Mark is in that shot where he's holding Gabriel's and Dave's hand - he is only capable of holding Gabriel's FINGER! He's so cute!

Yeah 🥺 with the heights that I decided on for them, I realized Mark's tiny little arm would barely be able to reach up and hold Gabriel's hand, so he just had to hold onto one finger

What a mismatched little family they are

Why is alt!Cesar and Mark's friendship so wholesome?

Real!Cesar & Mark's is like the standard teenage boys' where they shit on each other, while alt!Cesar's over here threatening other alters who get a bit too close to his claimed and bagging to his (homophobic) coworker about his amazing roommate/friend

Human Cesar and Mark indeed had a friendship like any other pair of teen boys. Perhaps the ribbing was. A little too hard from Cesar at times, but Mark’s never had friends before, so he can’t blame him for not quite keeping up with the blows.

As for alt!Cesar…

…Perhaps he merely became exactly the kind of friend Mark needed.

(imagine making a TMC au in 2025)

Flower Fungal Infection AU (TMC)

‼️Takes place after Catalyst ‼️

The dead resurrect and are now mindless zombies covered in plants. The fungus builds up around wounds or certain places that caused the death. The fungus is a parasite, using the dead as hosts. The spores of the fungi are deadly toxic to alternates. Some alternates die, some hide, a rare few fight. The fungi are also deadly toxic to other species, especially humans. Inhaling the spores is fatal, as the fungus tear you from the inside out, turning you into a mindless zombie. Best advised wearing a mask when venturing outside.

The fungi can enter the body in a few ways. It can enter the lungs after inhalation, corrupting the lungs and taking over other organs slowly. It can also enter open wounds into the blood line, infecting a little quicker than through the organs. Early symptoms can be (but not limited to) coughing up bloody petals/leaves, sudden aggression, migraines, dizziness, hallucinations, a sudden urge to go outdoors in infected areas.

‼️The infected can be killed off. Alternates cannot get infected, they'd just die. You can prevent an infection before it starts by cutting the infection out within 3 days‼️

Characters

Mark Heathcliff. Status: infected.

Cesar Torres. Status: Was infected, leg was cut off to prevent infection; Alive.

Adam Murray. Status: Alive (immune) but mentally unwell. Grieving.

Jonah Marshall. Status: Infected. Caged up to keep Adam sane.

Sarah Heathcliff. Status: Alive. Hiding out with Cesar.

Evelin Miller. Status: Semi-alive. Hiding in the Mandela County Police Department. Alone, dying of starvation.

Thatcher Davis. Status: Alive. Hiding with Adam and infected Jonah. The reason Adam hasn't done anything fucking stupid.

Ruth Weaver. Status: Dead. Was shot by Thatcher. It was a dark time.

Dave Lee. Status: Infected.

Stanley. Status: Alive, in hiding.

Lucifer. Status: Alive, also in hiding.