Tanjirou Kamado
The second he sees you hit the floor, he's running towards you. He'll try his best to catch you before you hit the ground, and he'll try to move you into cover. He couldn't bear to see you hurt or damaged any more than you already are.
When the fight is over is when he really begins to allow himself to think about it. He feels guilty that you had to save him. He feels guilty that he's the reason Nezuko's best friend is dead. He feels guilty for the fact that the girl he's always been in love with is dead because he was careless.
He almost didn't go to the funeral. He didn't know what would happen when he sees you, wearing white. He likes to think that you were an angel. That you feel happier this way, away from all the death and suffering.
Tanjirou just can't help seeing you everywhere he goes. There's always something that reminds him of you. He's never visited your grave because he's afraid of what you might say if you could.
He might move on but he'd never get over you. You were his first-ever love, and he feels like it's cheating to just forget about you after your sacrifice.
To be honest, he knows that if you came back, he'd still love you the same as he did so many years ago. He knows, understands, that no one really gets over you.
Zenitsu Agatsuma
Since he's asleep during battle, he wouldn't notice until he woke up after.
He sees you on the floor, with Nezuko hugging you to her chest and Tanjirou looking crestfallen as he side hugs his sister.
Zenitsu will see that and instantly know what happened. He's startled that you of all people had fallen during the battle. He always thought you were unstoppable, because to him, you were.
When he's told that you died to save him, he cries. Not overdramatic tears. They stream down his face like tiny rivers, but no sound came out just yet. Tanjirou wasn't sure if he was hyperventilating or just gathering enough air to imitate a tornado siren.
He cries himself to sleep most nights, holding a pillow doused in your favourite smell or perfume. He knows it's unhealthy but he just cant stop because it makes him feel better.
I think at this point, he's scarred by it, having loved you so deeply and truly, he just doesn't want to do it again because it ended in you dying for him.
Inosuke Hashibira
He's angry but it's mostly fuelled by sadness. He'll finish the fight quickly, in a fury, and then he'll be left in its wake with your body.
He'll full-on wail. He throws off his boar head and he hugs you so close to him he can feel your cold skin begin to warm up from his sweaty body. That gives him horrible false hope.
He carries you back, even though you're miles from the demon slayer corp.
At first, he was under the impression that Shinobu could bring you back. So when she said it wasn't possible, he really began to think about the gravity of the situation.
He'd lost his mate- his soulmate.
He'd wanted a family with you, a home where he could come back to you each night and lay in your arms. Now you're laying in his.
He doesn't want to get a new partner because he can't get over you. If he ever tried, he knows he would just keep comparing them to you. And you'd still be the better one.

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Demon Slayer Preferences and Imagines
FanfictionBecause everyone simps for at least one of them 1 in preferences- 19/08/2021