Charlie:

-Will most likely be royalty related (Ex: Prince, Princess, Princex)

-Or maybe Apple of my Eye

-She would be like being called Sweetie or Darling

Alastor:

-He would call you something extravagant yet cute

-So you'd probably be calling My Dear or Love

-He'd like the same in return so he would like being called My Love or Sweetheart

Angel Dust:

-He may not show it but he loves nicknames

-He'll want something simple for the both of you but something that will also stand out

-He would call you Simp, Cutie, or Babe

-He'd like to be called Love, Lover, or Handsome

Husk:

-He never really liked nicknames but he wouldn't complain much either

-He'd like something simple so he'd be called Handsome or Babe

-He wouldn't really call you by any nickname except for Cutie here and there

Nifty:

-She looooves nicknames

-She would love any cute nickname you call her

-You would commonly call her Little Cutie, My Lover, or Baby

-She would call you My Love, Teddybear, or Cutiepie

Henry:

-He's a whore for nicknames, especially if there's a history behind them

-So he'd commonly be called Loverman, Darling, Sweetheart, or My Hero

-He would try to be creative with his nickname for you, he tried his best

-Henry would call you My Cute Little Lover, My Hope, or My Treasure

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A/N: Want any specific scenarios? Please request, and don't be shy about them either.