I think the only ones I'm missing at this point are Crisis Core (which is on the shelf waiting) and the various Crystal Chronicles, so...yeah. XD
Tactics Advance and TA2 both say they take place in Ivalice, but share no settting places at all with FFXII, FF Tactics, or Vagrant Story. (For that matter, no place-names in FFT match up to FFXII, and there are only the most tenuous of connections between the two; FFT is set 500 years after FFXII and has one character with the same surname as Balthier, and heavily features the Glabados Church which is only vaguely referenced in FFXII.) A few FF12 characters make cameos in FFTA2 (Vaan, Penelo, Montblanc, and Al-Cid), while two FFTA characters make cameos in FFTA2 (Montblanc and Mewt.) While the connections are definitely there, I'd say they're too tenuous to consider it even an umbrella fandom. (The main link between FFTA, FFTA2, and FFT is the battle system, anyway.)
I wasn't even aware there WAS a link between FF7 and FFX compilations. I know FFX is the only other game to feature the Magus Sisters from FF4, but I wouldn't say that connects the canons.
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Tactics Advance and TA2 both say they take place in Ivalice, but share no settting places at all with FFXII, FF Tactics, or Vagrant Story. (For that matter, no place-names in FFT match up to FFXII, and there are only the most tenuous of connections between the two; FFT is set 500 years after FFXII and has one character with the same surname as Balthier, and heavily features the Glabados Church which is only vaguely referenced in FFXII.) A few FF12 characters make cameos in FFTA2 (Vaan, Penelo, Montblanc, and Al-Cid), while two FFTA characters make cameos in FFTA2 (Montblanc and Mewt.) While the connections are definitely there, I'd say they're too tenuous to consider it even an umbrella fandom. (The main link between FFTA, FFTA2, and FFT is the battle system, anyway.)
I wasn't even aware there WAS a link between FF7 and FFX compilations. I know FFX is the only other game to feature the Magus Sisters from FF4, but I wouldn't say that connects the canons.