Akaza: Babe,Honey, Sweetheart, etc.
Douma: Little Lotus, Lotus Bloom, Flower, Darling, Dear, can get real sappy or hell associate you with things that he feels now thanks to you like Color, Rainbow, or My Happy
Kaigaku: Fiance (yes he considers that an affectionate nickname), Wife, Girlie, sometimes sweetheart
Kokushibo: Wife or Dear otherwise he'd call you by your name
Enmu: Begonia, My Darling, Dear, Sweetie, also can get real sappy
Gyutaro: My light, my world, love, and gorgeous, mostly names that praise you or tell how much you mean to him
Aizetsu: Honey, sweetie, blossom, bunny.
Sekido: Like Kokushibo will mostly just call you by name but if feeling affectionate will call you wife or love
Karaku: will call you the most embarrassing ones to get on your nerves: snookums, teddy bear, muffin, cupcake, the list goes on.
Urogi: Baby bird, feather, baby, babe, or Pretty.
Kyogai: Flower, Petal, my rose, honey, love, dear, and on really affectionate days My Inspiration and Passion

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Demon Slayer Posts
FanfictionMultiple headcannons, random posts, and x reader stuff from my Tumblr for Demon Slayer.