Season One
1. Rarity (three top-tier episodes and loads of internal conflict)
2. Pinkie Pie (enigmatic, unpredictable, surprisingly deep)
3. Applejack (a one-note joke but a funny one, played well off Rarity and Rainbow Dash)
4. Rainbow Dash ("Sonic Rainboom" was tits, able to be an asshole without being unlikable)
5. Twilight Sparkle (witty and fun, annoying when she is in episodes where she is not needed)
6. Fluttershy (total load)
Season Two
1. Fluttershy (whoa, where did all this complexity and depth come from?)
2. Twilight Sparkle (on-screen just enough, neuroses make for great comedy)
3. Pinkie Pie (more cartoony but also provides more laughs)
4. Rarity (brilliantly conflicted in some episodes, flandersized in others)
5. Applejack (apples)
6. Rainbow Dash (Top Cunt in full-cuntiness)
Season Three
1. Pinkie Pie (by default, "Too Many Pinkie Pies" was good)
2. Rarity (hardly appeared at all which really worked in her favor)
3. Rainbow Dash (still a cunt, but she has a great dynamic with Fluttershy)
4. Fluttershy (good dynamic with Rainbow Dash, awful dynamic with Discord which really hurt)
5. Applejack (clichéd family stuff but not unlikable)
6. Twilight Sparkle (YOU MANIACS! YOU BLEW IT ALL UP! DAMN YOU! GODDAMN YOU ALL TO HELL!)
Season Four
1. Pinkie Pie (now very cartoony but her episodes are legitimately funny)
2. Rainbow Dash (finally gets some direction in life, likeable dummy)
3. Rarity (also more cartoony, she and Applejack have gone full-on "old married couple")
4. Applejack (funny as hell with Rarity, not so much without)
5. Fluttershy (all but disappeared)
6. Princess Twilight Sparkle (what? you can't just do nothing with her!)
Season Five
1. Rarity (single-handedly rescued the season and the franchise after the mid-season hiatus)
2. Princess Twilight Sparkle (hey, she is doing stuff now, and as hideous as the Castle Playset is it still make some sense of her princessness)
3. Rainbow Dash (oddly more identifiable now, a good mix of capable and in need of her friends)
4. Applejack (gets a rare bit of character exploration, still fairly flat)
5. Pinkie Pie (still funny, but the flandersization is getting painful)
6. Fluttershy (and what would you say it is you do here?)
Season Six
1. Applejack (gets a lot of screen time, seems almost like the main character as Twilight and the others disappear)
2. Rainbow Dash (fulfills her ambitions, really has nowhere left to go)
3. Rarity (ditto)
4. Princess Twilight Sparkle (new dynamic with Starlight Glimmer is under-explored)
5. Fluttershy (internal conflict is gone, not much of a character anymore)
6. Pinkie Pie (Daffy Duck with hooves)
Season Seven
1. Rarity (the new dynamic between her and the maturing Sweetie Belle is a highlight of the season, a couple genuinely good episodes)
2. Princess Twilight Sparkle (new princess duties, some of that old neurotic scientist shows through, a breath of fresh air)
3. Rainbow Dash (her role in "Secrets and Pies" was classic, did little else of note)
4. Pinkie Pie (ditto)
5. Applejack (are you still here?)
6. Fluttershy (ditto)