Hey, It's That Voice! - If you haven't noticed, The Ocean Group did the character's voice talents. And all of them did the voicing in several animated shows especially some of the Gundam dubs released. Reading this will make you Go Mad from the Revelation... maybe. So we have:
G3 Rainbow Dash (RAINBOWS DARLING! RAINBOWS!) is Venus Terzo, aka Ranma and Talia Gladys. Come to think of it, her riding the rainbows makes sense.....in the Minerva! MLP fans knew her better as the tomboyPatch.
Spike isVegeta (KAKAROTTOOOO!!!!), Andrew Waltfeld and Zechs Merquise. So now he can go Super Saiyan while piloting both the Tallgeese III and Epyon at the same time?
Cotton Candy and Core 7 Cheerilee isLouise Halevy. So now they were unstable Innovades piloting a monstrous GN-Drive Tau powered Mobile Armor? Well she is also known as Fashion-centric musician pony Melody.
Fashion-centric musician indeed. She's also Barbie...
Skywishes isLucrezia Noin. Come to think of it, both Noin and Zechs were reincarnated as a Pony and a Dragon in this Gen. And also, Noin's secret shame on not singing is revealed.
G3 Rarity isKati Mannequin. Now who promoted this Unicorn to Captain of the ESF army and decorated everything with Rainbows and Streamers??
If you think that's all cracked up, Imagine her as a Dragon Fairy.
Zipzee and Sweetie Belle isMileina Vashti, the third Madeline and Emmy. Mileina sounds like Sweetie Belle if she weren't inhaling Helium. This has not gone unnoticed.
And of course several G3 actors made the transition to G4.
Zipzee and Sweetie Belle. became Fluttershy and Pinkie Pie.
G3 Rarity became Spike, who has a crush on G4 Rarity, which is somewhat Hilarious in Hindsight, if you know what I mean...
Wysteria, Minty, Scootaloo, etc became Rarity, Granny Smith, and LUNA, PRINCESS OF THE NIIIIIGHT! Minty is also Derpy, which is prettyfitting.
Kimono, Puzzlemint, and Sweetberry became the GREAT and POWERFUL Trixie.
Brights Brightly became Gilda the Griffon and Spitfire the Wonderbolt.
Starsong and Tiddly-Wink became Diamond Tiara.
Twinkle Twirl, Apple Spice, Daisyjo and Piccolo is Daring-Do.
Tra-La-La is Princess Cadance.
Lily Lightly and Toola-Roola both became Little Strongheart.
What Could Have Been: Fiesta Flair, a character who appeared in the short Pinkie Pie and the Ladybug Jamboree never made it into toy form. Word Of God says that due to her Mexican accent, name and symbol there might have been backlash that caused Hasbro to rethink her development.