Thomas: Sweetheart. Because of how kind you are.
Newt: Love. Because of his traditional British nicknames. Sometimes he would call you My love or Lovie.
Gally: Baby Girl or Baby. It's simple, short, and sweet. Just like you.
Chuck: My Queen. He treats you like his whole world. It's cute because when you politely ask for something he goes "Yes My Queen."
Minho: Little Miss Sassy. It matches his nickname with yours
Frypan: Sugar Mama. Because your sweet like candy