III- Refia

IV- Rydia

V- Krile

VI- Terra

VII- Yuffie

VIII- Rinoa

IX- Freya

X- Yuna

XII- Ashe

XIII- Lighting

From the ones I played:

FFII: Maria, for a big variety of reasons, including her name.

FFIV: Rydia. Hands down.

FFV: Faris. The true leader of this game (at least after Galuf has parted ways with us), because Bartz absolutely sucks.

FFVI: Terra. Celes and Relm don't stay too behind though.

FFVII: Yuffie. The others suck anyway.

FFVIII: Selphie. If it wasn't just party members, then it would be Fujin or Ellone, but they don't count.

FFIX: Freya. Eiko is close, Beatrix too.

FFX: Rikku. The others don't stay too behind.

FFX-2: Paine. Now Rikku and Yuna lose easily.

FFXII: Fran. No, not for fan-service, I really like her line of thought and interactions with everyone, especially Penelo. Speaking of which, she is second, close behind.

Now, from the ones I haven't played:

Stranger of Paradise: Honestly, I don't know. Perhaps Neon, but I don't really know Sophia well yet to state who do I like more.

FFIII: Refia. Not only is she the only female (not counting Aria), but she seems like a nice gal.

Before Crisis: Martial Arts (Female) (Juget). She's so me, personality wise.

FFXII Revenant Wings: I'm not aware of every playable character, but Fran is playable again, so I'm choosing her for now.

FFXIII: Lightning. Fang and Vanille close.

FFXIII-2: Well, Serah is the only female playable, so her, I guess.

Lightning Returns: Lightning. She is the only one playable.

FFXV: Aranea. She can be adquired as a fighter in the end, and appears sometimes in some battles and stuff. The main party is still just men. Iris doesn't stay too far. Insta-kill attack, GOOO!!!!!!

Tactics: Agrias.

Type-0: Sice. Grim reapers are my weakness.

World of Final Fantasy: Reynn. She is the only female playable after all, but I do like her, unlike Serah.

There's a Crystal Chronicles game, I think it's the My Life as a Darklord or something like that, which has a character named Mira or something like that as its protagonist. I don't know Crystal Chronicles that well, but she seems cool.

Any other game not mention eitheir I don't know it has female party members or it simply doesn't, like Dirge of Cerberus. Or I just don't really know the game.

@CorujinhaGamer26 I agree lmao, I love Freya so much. Wish I had played FF9 tho 🤣

FFII - Maria. Her interactions with her brother is a cool concept (even tho it's not well executed)

FFIII - Aria, one of the only kinda memorable character

FFIV - Rydia, I like her character arc with her having to get over her fear of fire and all that

FFV - Faris, I like all of the FFV cast, but IMO Lenna and Krile are kind of overdone archetypes, so Faris is a breath of fresh air

FFVI - Celes, easily. I literally changed my IRL name because of her

FFVII - Tifa, if we're talking about the original game and the Compilation, Aerith if we're talking about the remake

FFVIII - Quistis, I kinda don't care about most characters, so she's the least worst

FFIX - Freya, female dragoons are badass

FFX - Yuna, she has such an interesting character arc

FFXII - Fran, I like her interactions with the party and her icelandic accent sounds so cool

FFXIII - Fang, female dragoons are badass, and lesbians are badass

FFXIV - Tataru, every cutscene with her is a treat, she's just so adorable

FFXV - Aranea, female dragoons are badass

FFIV: Rosa

FFV: Krile

FFVI: Terra

FFVII: Aerith

FFIX: Garnet

FFX: Yunie!

FFX-2: Paine

FFXII: Ashe.

FFXIII: Lightning and Fang