I get so unsettled when I hear the English voice of the cast, as I said earlier during Remake, having a cast with generic American accent with a handful of exceptions is solidly the most incomprehensible decision. Though no one will ever top Vanille is how she speaks is her characterisation key (something I have rarely seen in films or TV shows even).

Currently my own perception of each regional accents are:

Both Tifa and Cloud: neutral European accent with Norweigan/German lean, both will unintentionally change their accents a little based on who they speak to. (If we are doing the centre of the universe is US thing, I'm going for Appalachian.)

Aeris: Mild subtle urban London accent with a slight association with stereotypical low socioeconomic traditionally, but just enough that people would be careful to stereotype her. I think it's the industrial Midgar that makes me think of 1800s London? I'm also saying subtle because I don't expect full on Cockney. (If we are doing the centre of the universe is US thing, I'm going for old time 1950s Bronx.)

Yuffie: Rapid fire Japanese tinted fluent native level English. (If we are doing the centre of the universe is US thing, don't because it can't not be racist in this context.)

Barret: Generic American, I'll take that. Sorry.

Nanaki: BBC broadcaster English, to UK Public School Boy Posh English. The latter is a distinctive kind of posh that people can never regain once they hit adulthood.

Cait: Convincingly Scottish. Which is the official version.

Cid: Not just Queenslander, but like Queenslander who was originally from regional 130km away from Cairns to now living in Logan. I'm extremely apologetic about this one.

Vincent: I kept on thinking a mix of Romanian and Polish.