Rick: love because it makes you blush.
Carl: babe because it makes you laugh.
Daryl: angel because he's being sarcastic and it makes you giggle.
Glenn: sweetie because it's so typical of him to see the sweetness in everyone.
Negan: dollface because that's what you were to him. The most beautiful doll faced thing to ever walk the earth.
Shane: Baby girl because you were his everything plus it sounded so good in his drawl.