I won't spoil who but I just got done with the Mugen Train season of Demon Slayer and cried hard...so here's my characters reacting to that episode :'D 

I'm still kind of crying...

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Kay, Koy, and Bakugou watching. 

"Come on, kill that bastard!!" Bakugou yelled, standing up.

"He's right there!!" Koy shouted, holding his head.

"You almost got the demon!" Kay yelled at the tv.

Soon...

"No...come on no way!" Koy said, falling to his knees. 

"That bastard demon...got him?" Bakugou said shocked. 

Kay covered her mouth, eyes filling her eyes. 

"No...no not him...!" 

Bakugou growled a bit and pointed at the tv. 

"WHY HIM OF ALL PEOPLE?! STUPID DEMON!! I'D KILL HIM!!" 

Koy clenched his teeth, looking away with tears in his eyes. 

"I...I can't believe that..." 

Kay held her knees to her chest, covering her face and crying. 

"No, no way! Not like that! Ahhhahhh!!" 

Koy patted Kay's head as she cried. 

"Let's take a break..." 

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Ommi was standing as she stared at the screen. 

"Come on!! Just slice his head off already!" 

Keigo just smiled as he watched, thinking Ommi was adorable. 

"You really like this guy, huh?" 

"Of course, he's one of the best-" 

She started, before looking at the screen. 

Seeing it had happened...

"What...no, no way! Not him! What?!" 

Keigo looked and saw what she saw. 

"Damn..." 

Ommi sat down, looking down sadly. 

Keigo gently rubbed her back. 

"Hey...maybe he's okay?" 

"Mmm...I doubt it...but thank you..." 

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Don't have the energy to do the rest...but if you know, you know...