G4 Pinkie, G3 Pinkie, Hotblooded Pinkie, Nerdy Pinkie, Surprise, Pinkamena.  
Needs more:  
Goth Pinkie, Jock Pinkie, Evil Pinkie, G3.5 Pinkie, Filly Pinkie, Human Pinkie, Alicorn Pinkie, Stoner Pinkie, Pinky Py, Bubble Berry, Pinkie Twins, Pinkiepool, Baby Pinkie Pie, Discorded Pinkie, Pinkie with AJ cutie mark, Scientist Pinkie, Farmer Pinkie, Fakie Pinkie, Alien Pinkie, Superhero Pinkie, Mutant Pinkie, Robot Pinkie, Barbie Pinkie, Artist Pinkie, Pinkie born in RD s’ place, Skater Pinkie, Bad Future Pinkie, Troll Pinkie, Rockstar Pinkie, Twice as Fancy Pinkie Pie, Eip Eiknip, Rasta Pinkie, Cultist Pinkie, Discord s’ apprentice!Pinkie, Model Pinkie, Sailor Scout Pinkie, Power Ranger Pinkie, Mecha Pilot Pinkie, Anthro Pinkie, CWC Pinkie, Karateka Pinkie…

Diane Pie could be Marle.
 
Royal connections and all that.

It’s kind of depressing that I instantly knew which character each incarnation represented.

hot blooded pinkie is ayla, pinkamena is magus, nerd pinkie is lucca, pinkie pie is chrono, surprise is frog i guess. i feel bad leaving g3 pinkie as robo though.

…So which Pinkie would fit which role?
 
Hot Blooded Pinkie Pie would obviously be the fighter / monk character who can buff the entire party