-Moving ears, eyes and tail (My Pretty Pony, Happy Tails, Dance n' Prance)
-Multicolor/Rainbow hair (Rainbow Ponies, Quackers, Bouquet and several others)
-Glittery symbols (some Rainbow Ponies)
-Sea Ponies (this isn't a 'specie' list but I want to add them here because they were meant to be bath toys)
-Flocked (SS)
-Eye gems (TE)
-Beddy-Bye Eyes
-Symbols all over the body (TaF)
-Tinsel Hair (Princesses)
-Medallion symbol (Princesses)
-3D symbols (Sundae Best)
-Scented (Sundae Best, Perfume Puff, Sweetberries, Candy Cane...)
-Growing Hair (BnG)
-Changing symbols (Magic Message)
-Changing body/hair colour (Watercolour baby sea-ponies, Sunshine Ponies)
-Carrousel capes (Carrousel ponies)
-Curls (Candy Cane, Rainbow Curl)
-Perfume Puff hair (better known as 'afro'
)
-Glittery body (Sparkle Ponies)
-Jointed, posable (Ballerinas)
-...Drink n' Wets
-Glows in the dark (Glow n' Show)
-Precious Pockets
-Secret Surprises
-Talking features (Sweet Talkin' ponies)
-Flower Fantasy-like symbols
-Cascading symbol (Rose Dust)
-Colorswirl-like body pattern
-Pearlized finish (some baby seaponies, I think)
-Streamers (Birthday Pony)
-Rollerskate ponies
-Horizontal streaks (Scribbles and Dabble)
-Fiber Optic crown (Princess Sparkle)