Demon Slayer Preferences and Imagines

Telling them you love them at random times

Tanjirou Kamado

He'll look at you with a huge smile and a blush on his whole face. He won't hide away if people are watching either, he'll just say it back, albeit a little bit shy. Most likely, it'll end with you getting a kiss on the forehead.

Zenitsu Agatsuma

He does this too, and no one can say different. You'll automatically get a cuddle from him and he'll say it back immediately. Usually, it's him who does this so when you do it, he takes it as a massive compliment.

Inosuke Hashibira

He gets super cocky about it if other people are around. He'll just start shouting about you loving him and not them. He will say it back after though. He won't ever tell you, and at the moment, he doesn't understand it, but when you say that, he feels like he's falling and flying all at once.

Genya Shinazugawa

He kind of bursts into flames from how blushy he gets. If there are people around, he'll probably turn to you and nuzzle his face into your hair to hide from other people, so they don't see. He'll whisper it back to you shyly.

"I-I love you t-too"

Pillars

Giyuu Tomioka

If it's around the other pillars- namely Shinobu- he'll say, completely deadpan, "See people do like me"

He's the type to kiss your hand rather than say it with words. Just know that if he gives you affection after, he means he loves you. If it's in private, he's obviously saying it back (Plus the affection).

Kyoujouro Rengoku

Immediately says it back. He doesn't care who's watching, he wants people to know that he loves you. He's gonna wrap an arm around your waist, pull you to his side and then rest his chin on your head <3

Sanemi Shinazugawa

He is just all blush. And since he's learned his lesson, he's gonna say it back, despite having other people around. It may be quiet but he does say it. He might try to act all cool and put his arm around your shoulders like he's some kind of greaser too.

Muichiro Tokito

"Who are you again?"

Jk, jk

He says it automatically as soon as he hears it. He knows that if he doesn't, he might forget to. He might also kiss your cheek quickly before acting like nothing happened <3

Shinobu Kocho

She'd be a little shocked at first but in a nice way. After a couple seconds, she'll say it back, still quite flustered. She'll do that awkward cute hand holding stuff too :)

Mitsuri Kanroji

She honestly does this more than you do and even so, when you do it to her she gets madly flustered and blushy. She'd stutter and then cuddle you <3

Obanai Iguro

He is very, very flattered. It really means a lot to him after all those years of him believing he doesn't deserve love. He wont fight you on it purely because he loves the feeling of potentially being loved by someone like you. He would say it back but he doesn't know if it's possible to find words to express how he feels about you

Demons

Muzan Kibutsuji

He doesn't seem like he loves you a lot of the time because he is so busy, but he does- as hard as it is to believe. He says it back right away, and then acts all casual. If he has enough time, he'll snuggle with you for a while but if not, he'll settle for a kiss.

Yushiro

He fights the urge to get tsundere and tell you to shut up. He does this cute little eye twitch and that's how you can tell. He does finally get over it and says it back. He'll cross his arms and then tell you not to get too overexcited just because he said it. (Hold his hand after and he'll melt. He will take back everything except those "I Love You"s)

Nezuko Kamado

Happy Nezuko noises. She'll jump on you and hug you, nuzzling ito your kimono before kissing you through her muzzle.

Upper Moons

Kokushibou

If we go by the timeline where Muzan knows of and accepts you, then he will say it back no questions asked and he wont care who sees or hears it. 

He's really good with words.

"I've seen so many fallen stars but you are by far my favourite"

Douma

He teases you and says that he knows rather than saying it back. If you just walk away though, he'll run after you, screaming that he loves you too.

"No, no wait! I love you, in fact i love you more!"

Akaza

He's also pretty romantic. He'll say it back but in some really poetic way. 

"I'd walk into the sun just to see the way your hair sparkles in the light"

"I didn't know basketballs studied poetry"