Note: I will connect two place is Nova City( where Elon, his friend and Zukomaru in) and Elon's house (where Theodore and Muzan in).

(Elon and Theodore): And now, we are ready to fight!

(Zukomaru): Oh! Intersting! 

(Muzan): Just come!

(Elon): Alright!

(Theodore): Whatever! Just come! 

And Elon and Theodore with Zukomaru and Muzan start fighting. With Raging Fire Eyes, Elon and Theodore can see through the enemy's movement so they can defeat with small attack easily.

(Leonard): Elon! Do you know what are you doing? You can be blind and its can't be heal!

(Elon): I know! But don't worry! I'll be okay!

At Elon's house, Theodore with Raging Fire Eyes and Muzan are fighting. With Raging Fire Eyes, he can see through all movement of Muzan.

(Theodore): I can see your movements, Muzan!

And he uses his Nichirin Blade to attack Muzan.

(Muzan): No! That can't be! How you can do that?

(Theodore): With power of passed away Fire Pillars and with power of my friend, my family, I will defeat you!

At Nova City:

(Zukomaru): Why you become strong suddenly?

(Elon): I have my friend, my family and my Infinity Warriors! With them, I will wiping out demons from the Earth!

(Muzan): You stupid!

(Zukomaru): You will never can wiping out the demon from the Earth!

(Theodore): You wrong! Although the demon is really strong...

(Elon): But humans will always winning the demons!

(Zukomaru): Nonsense!

(Leonard): I won't let you do that! Breath of Water 1st form: Peaceful Water Surface!

And a silent water surface appear around Leonard, Zukomaru and everyone.

(Zukomaru): What the heck? Although which attack, I will disable them!

When Zukomaru rushed forward to Leonard, the water surface has stopped him.

(Zukomaru): What? I can't move!

(Leonard): You don't know? My water surface can stop any attack of the enemy so you will never can attack me and everyone!

At Elon's house:

(Muzan): I will defeat you!

(Theodore): Of course I won't let you do that! 

(Theodore): Breath fo Fire 3rd form: Fire Star Attack!

And many fire star appear in the sky and attack Muzan and Theodore finish them with a slash.

(Muzan): No! That can't be happen!

At Nova City: 

(Leonard): Everyone! Go and cure everyone!

(All): Allright!

(Leonard): And I and Elon will finish this guy! Lets go, Elon!

(Elon): Okay!

(Leonard): Breath of Water Final Form: Ice Water Eyes!

And his eyes turn into blue with light blue waves.

(Elon): I worry that he will return to normal and attack us!

(Leonard): Don't worry! I can foresee his movement!

And with Ice Water Eyes, Leonard can foresee that Zukomaru escape form Leonard's water surface.

(Leonard): He will be escape from the water surface!

(Elon): What?

And Zukomaru has escaped from the water surface as Leonard said.

(Leonard): Elon!

(Elon): Breath of Fire 1st form: Fire Cutting!

And Elon imeediately slash Zukomaru and he got injured.

Elon's house:

(Theodore): And now! Take my strongest attack!

Then he jump up to the air and create a fire cyclone around him.

(Muzan): What?

(Theodore): Breath of Fire 12th form: Raging Fire Star Circulation!

And he uses a impact slash with his fire stars cyclone and try to cut Muzan's head.

At Nova City:

(Elon): Leonard! Lets use our strongest attack!

(Leonard): Okay!

And they jump up to the air and create a fire and water cyclone around them.

(Elon): Breath of Fire 12th form: Fire Circulation Attack!

(Leonard): Breath of Water 12th form: Water Circulation Attack!

And they both slash Zukomaru's head.

(Zukomaru): No! Its can't be!

(Muzan): No! The human are too weak! They can't protect themself!

(Theodore): No! The human doesn't weak!

(Leonard): They have friends, family and everyone always with them!

(Elon): No matter how strong the demon is...

(Demon Slayer Trio): Human will always be victorious against evil forces!

(Muzan): NOOOOOOOOOOOO!!!!!!!!!!!

(Zukomaru): NOOOOOOOOOOOOOO!!!!!

And both Muzan and Zukomaru's head were cut off and their heads were lying on the ground.

(Theodore): Few! Finally, everything is over!

(Elon's parents): *hugs* Theodore!!!

(Theodore): Hey! What the heck are you two doing?

(Elon's dad): Good job! You finally defeat Demon King Muzan!

(Theodore): Yes! I did it! I did it!!!

And at Nova City, after defeat Zukomaru, Elon and Leonard's eyes return to normal but Elon's left eye has totally blind and they were exhausted so they lying on the sidewalk, they hands still holding their Nichirin Blade.

(Leonard): Elon! We finally did it! Right?

(Elon): Yes! We did it!

(Leonard): Yeah! But Elon! Your lelf eye...

(Elon): Yes! That's the price to pay for using Raging Fire Eyes!

(Leonard): I have used Ice Water Eyes but my eyes still normal! I think a miracle has protected me!

(Elon): Yeah! I hope someone will heal my eyes! I still have my family! I think they and Theodore are waiting for me and you right, Leonard?

(Leonard): Yeah!

And suddenly, a light make them can't see anything and when they open their eyes...

(Elon): Uh...

(Leonard): Where are we?

They are lying on a beautiful flower field.

(???): Elon! Leonard!

(Elon): Who calling us?

And a woman with black hair are tie back with a black kimono with flower patern on it appear in front of Elon and Leonard.

(Leonard): Who are you?

(The woman): I am Tamayo! And I has heard your wish so I will heal your eyes, Elon!

And she uses her healing power to heal Elon's left eye.

(Elon): Thanks! My eyes is okay now!

(Tamayo): Actually, you look like a boy that I have save just like that!

(Leonard): Who?

(Tamayo): He is 25th Fire Pillar.

(Elon): You mean Theodore?

(Tamayo): Yes! At the first time he uses Raging Fire Eyes, he also got blind just like you and I have heal his eyes and also gave him a ability can uses that form without get blind!

(Elon): Now I know why Theodore can uses Raging Fire Eyes without get blind! You have gaiven him that ability?

(Tamayo): Yes! And you had that ability like him!

(Elon): Using Raging Fire Eyes without get blind?

(Tamayo): Yes! And now, return to your world!

And the light appear again and they return to the sidewalk. 

(Elon): Allright! Lets go home!

(Leonard): Yeah!

And they with their Infinity Warriors go to home. In that time, Harrison, Donald, Kira and Alvin has come to Elon's house and Theodore and Elon's parents has waiting for them.

(All): We're home!!

(Theodore): You all saved everyone?

(Kira): Yes! We did it!

(Elon's mom): But where Elon and Leonard?

(Theodore): They don't go home with you?

(Elon): *from the distance* Everyone!!

(Alvin): That's Elon and Leonard!

And Elon and Leonard with their Infinity Warriors has come home.

(Elon's parents): Elon!

(Elon): Mom! Dad!

And then they hugs him and there are a happy scene.

(Kira): You and Elon has defeat that demon right?

(Leonard): Yes! We defeated him!

(Theodore): And I have defeated Demon King Muzan!

(Leonard): What? He is really strong but you can defeat him?

(Theodore): Yeah! Although I have to sacrifice myself once to defeat him!

(Elon): Thats mean you have died once to defeat Muzan?

(Theodore): Yeah! But with the help of 24th Fire Pillar, I have won him!

(Elon's dad): Okay kids! Lets go inside! Lets have a party to congratulate us all to defeated the demon!

(All): Party? Awesome!!

(Urokodaki): Wait! Wait!

(All): Urokodaki-sensei?

(Urokodaki): Can I join the party?

(All): Of course!

(Elon's parents): Everything has done! Lets go inside and have a party!

(All): YES!!!!

And they go indise and have a party cuz they deserve it because they fought hard to destroy the demons so having a party is obvious.

(Elon's mom): Oh wait! Theodore! I want to talk with you!

(Theodore): What's up?

(Elon's mom): I really thank you to you cuz you are a person who has defeated Muzan so...

(Theodore): So what, ma'am?

(Elon's mom): If you want, will you become my son?

(Theodore): What? 

(Leo): Thats mean Theodore will become your brother, Elon!

(Elon): Really? That's awesome!

(Theodore): *sigh* Okay! If you want!

(Leonard): But why did you want Theodore become your son?

(Elon): You know that! He has red hair, red eyes just like me!

(Theodore): Yes! And its wonderful!

(All): *laugh*

And finally, Muzan and his demons has defeated again by human and the Earth has saved again.

Note: This is not the end. I will make part 2 of character profiles. Please watch! Love you!