It varies from horse to horse, but my one-size-fits-all would be noodle (especially when spooking at something ordinary), squish (usually when sleepy) and darling.

Fabio:

Fobs, Shark, Cowpony, Most Handsome Pony in all the Land

Pedro:

P-row, P, Sweet Boy

Mini Me:

Mini, Cute Guy, and, most recently, Dickhead (after he stomped my knee into the ground when I fell off)

Dante:

Bad Bad Naughty, Stud Boy, Handsomeness, Wing Nut

Fam Fam goes by

famfamfamfamfamDOODLES!

Mardy Arse

Big Bum

Silly lad

Little Lad

Stupid Face

Fami

and Pombalinha goes by-

Pomba

Pomba-Nomba

PomPom

Ninha

I don't own any horses, but these are my lesson pons:
Deacon: D, Sexy, Sexy Boy, Big Sexy. He's 18 hands, and the first horse I ever fell off of XD.

Joab: Job(Pronounced as H like the J is sometimes in Spanish,), Hobie, Hobie wan Kanobie XD.

Virginia: Gin, Ginny, Naughty Girl.

Roxy: Rox, Roxy O Moxie.

Bravo: Bravo, Golden Child, Golden Boy, "Get up you lazy horse", "stop rooting" XD.

A friend's horse that I ride from time to time: Prince, Princy, Eye Candy, Hot Rod, Speedy Gonzalez.

And someone's horse in the lesson barn(not one of the lesson horses,) who can be a bit of a brat: Sophie, Brat, Noisy, Biotch, Nasty.

my two mares willow and Stella have the same nickname:

pretty girl

sweetie

sweetheart

my retired QH Blue:

boo

buddy

big guy (even tho he's only 14.3)

the 3 other random pasture boys:

buddies

big guys

our yearling preacher:

baby

buddy

bud

big guy

my moms horse aspen:

annoying little thing

My mare's name is Willow (Willoways Be Mine). She goes by:

Willoughby

Wildebeest

Wilsy

Beastie

Lady

Little Lady (she's not little in any way)

Ma'am

Dum-dum

Mama

The Princess

gin

stupid

rude

bitch

big dog with four legs a mane and tail

Pogo:

Poggle

Pig

Pigs

Pigpig (said veryvery fast)

Pigolo

Nur

Bugs

*

Cliff:

Cliffy

Cliffyman

Clifford

Dragon (but roll the r a bit)

Baby Dragon (in a weird accent)

BD

Horse

Dipshit (affectionate)

I have a lot of horses so I will just do one lol

Ruby:

rudy duby boobie!!
🤣🤣🤣🤣🤣

My horse is named Charisma, I call him Rizzy.