Is it so much visual characteristics as in "art style between games," or rather visual characteristics as in 'the general attributes of certain creatures'? Genuinely asking, because I can't make up my mind; I feel like there's a distinct difference between the two but I can't exactly put my finger on it.
Shiva for example I only recognised because she manipulates ice and the trailer is titled Final Fantasy. But put her in an untitled trailer, and my mind's definitely not going straight to Shiva.
If I take a step away from that, I recognise the Malboro because it's a Malboro, but it's definitely not the art style per se I recognise:
That Malboro could be in a completely different art
style (say, Bob's Burgers?) and I would still recognise it for what it is.
But if I take one step further back, when on screen there's no creature closely associated to Final Fantasy, I honestly could never guess that it is in fact Final Fantasy:
With these, tell me it's a new Korean M.M.O. and I'll believe you. Though I've not played a Final Fantasy beyond 13-3, so I guess I'm not at all familiar with the new FF style.