The scope of this is currently limited mostly to what was released in the US, though it is slowly being expanded.

Pictures when clicked will show you a larger version of that picture. The name under the picture is a link that will take you to that pony's page. Many ponies have symbol close-ups on their pages to help you identify your pony, as well as more detailed descriptions.

Keep in mind that G1 ponies are 20 years old at minimum, and tons of fun to play with. You may have to use your imagination in cases of cut hair, rubbed symbols, and broken mechanisms.

Remember, if you know your pony's name you can just type it into the search bar on the top!

Adult

Including big brothers and sweetheart sisters.

Various Adult Pony Genera

Larger Groups
Twinkle Eyed Ponies, ponies with gems for eyes
So Soft Ponies, ponies with soft, furry bodies
Big Bother/Daddy ponies, adult ponies with molded fur around their hooves
Sweetheart Sister Ponies, 'teenage ponies' with very slender bodies and smaller heads, often with a flower earring or hole in one ear
Flutter Ponies, ponies with fairy wings, or more often only a hard plastic buttons on their backs with ports that the wings used to fit in to
Winger Ponies, small ponies with butterfly wings (or a bit of hard plastic flush in her back that may have once held wings)
Ponies in the collector pose, the first and most iconic My Little Pony pose
Translucent Ponies, ponies with translucent bodies filled with either glitter or sprinkle/confetti-looking bits

Smaller Groups
Perfume Puff ponies, ponies with super puffy and perhaps unmanageable hair
Magic Message ponies, ponies whose symbol changes when you rub it; the symbol has a plastic-y decal quality unlike the paint used on the pony's eyes
Sippin' Soda ponies, ponies with small round holes in their mouths for soda straws
Sweet Talkin' ponies, ponies with speakers on their tummies; ones with good batteries will talk to you when you squeeze their rump
Secret Surprise ponies, largish ponies with hard plastic saddles that open up, or a rather sad, large, rectangular hole in their backs
Ballerina ponies, ponies with posable legs and molded ballet slippers
Ponies in the bride pose, an earth pose that is more elongated than normal poses

Tail Action

Does your pony's tail do something awesome?

Can you pull it out then crank her head to pull it back in?
Does she have a hard plastic ring around her tail? Does her tail spin when you squeeze the pony?
Does she have a knob on her chest that winds up to make her tail spin?

My pony has tail action!

Bouquet (Brush 'n Grow Pony)
Tap Dancer (Dance 'n Prance Pony)
Skylark (Princess Brush 'n Grow Pony)
Tossles (Happy Tails Pony)

Symbol Types

3-D Symbols

My pony has a 3-D symbol! (Including Merry Go Round Ponies.)

3-D Symbols
Brilliant Blossoms (Merry Go Round Pony)
Princess Serena (Princess Pony)
Sweet Pocket (Precious Pocket Pony)
Peppermint Crunch (Sundae Best Pony)

Twice As Fancy

Is her symbol all along her flanks? Is her symbol an image or theme repeated more than once on each hip? She is a Twice As Fancy Pony!

Glittery Symbol

She is an adult ponies with a glittery symbol! (And not a Sweetheart Sister Pony.)

Skydancer
Skydancer's symbol
Twilight
Twilight's symbol

More regular pony!

She is just a regular pony! Non-puffy hair, no weird holes, no glitter, no hard plastic attachments, 2-D single symbol only on her hips and not all over her flanks...

She is a more regular pony.

Sea Pony or Mermaid Pony

She's an aquatic pony!

Non-pony Animal

It's a Pony Friend/Pretty Pal!

Make sure it is not a Fairy Tail Bird or a Moon Dreamers Friend.

Fairy Tails Tiffany Tails
Moon Dreamers Rory
Moon Dreamers Ursa Major
Moon Dreamers Ursa Minor

Baby

Is your Baby pony a boy, a teeny tiny baby, a newborn, or rather regular?

Baby Boy Ponies

Does your small-sized pony have a kind of big head, an open mouth and either feathers around its feet or molded horse shoes?

It's a baby boy pony!

Teeny Tiny Baby Ponies

Is your baby pony just insanely tiny? With the smallest button nose, her head actually about half the size of the entire rest of her body, and just over 2" tall?

She is a Teeny Tiny Baby Pony!