Headcanons: Nicknames for Bonnie ships
Kai: We’ve already seen with BonBon, he’s going to come up with fun nicknames that’ll be sarcastically shippy like Bae, Babe, Baby, Honey, etc.
Damon: Also as seen, he’s going to always find bad puns that have to do with being a witch.
Stefan: I don’t actually see him calling much beyond her own name. He never really struck me as the nickname type, but I could see him calling her Bon.
Tyler: Last name, Bennett. He hasn’t really out grown his jock days completely so he’ll still refer to her by her last name (which make the TATBILB AU by @jazzywazzy89 all the more perfect to me).
Klaus: Again basing it off the show, he’ll have fun little nicknames that’ll sound old like my little witch, or witchling, or little bird because they have the dynamic Bamon from books had more than show Bamon.
Elijah: He’d call her Ms.Bennett well into their marriage and when she’d ask him why he’d say, “I wouldn’t have it any other way.”