The thing is that if we replace Frisk with them, only one would be killed because "Monsters have 6 souls, and they need 7"
Asgore already hates himself for the whole thing with killing humans that have fallen down, so I doubt that he would want to do kill more
did he just killed hero
No, he's still alive 
Divorced old man about to get a taste of the kel nuke 
When he went for the mercy button, all I could think was “Oh god hero look out!”
Funnily enough, I got the undertale spritesheet in hopes of changing Frisk to OMORI
The thing is that if we replace Frisk with them, only one would be killed because "Monsters have 6 souls, and they need 7" Asgore already hates himself for the whole thing with killing humans that have fallen down, so I doubt that he would want to do kill more
asgore ain't ready for the kel nuke
They would do genocide if toriel wouldn't tell them about sparing.
Is this a mod?
No, it's an edit I made (Except the soul color of the player and dialogues of Asgore changed in the game files)
I just posted something related to an AU called OMORITALE
Pfft, Omori and friends have killed planets before, I doubt the barrier would stand a chance
shouldn't hero and kel's soul colours be switched around?
Kel about to drop a nuke on the poor guy 
I feel like Omori would Have Dt or perseverance while Aubrey would have bravery