So im a huge fan of using pet names. I try to come up with fresh ones all the time as i like to mix them up on a girl instead of using the same old boring ones.
Sometimes they are completely void of meaning i just use them, sometimes they are situation like the person is sick or triped or something, sometimes they are racial but apropriate.
I try and use these asap, the sooner you introduce these the better. Some good signs are when a person refers to themselves using your pet name, gets goofy or points out when you dont use the same one, or pretends to be mad about it.
Just note that these are not listed into any gender specific context, but some of these will work for guys/girls, some will be girl only or guy only...im sure youll figure it out.
CHICA
PUMPKIN
SUNSHINE
MISSY
SMILES
SILLY
GIRLY
SNIFFLES
GRUMPY
CHIEF
CAPTAIN
BOSS
GUY
FRIEND
BUD
MAN
BRO(THER)
DUDE
JOKER (JOKA)
MA'AM (use this with a girl too young lol)
KIDDO
PEACHES
...to be continued
Thats what i could come up with off the top of my head, also naming any guy a girls name, "Hey Sally what do you think your doing?" is hilarious. There are plenty of original ones that are kinda hard to add because they are unique to a stiuation or event. My buddy found out his mom's nickname in college was LEGS, so we all call her legs. Things like that would be odd to add to the list, without explination.
So ill add more as i think of them and you guys can as well.