The gameplay is just like modern Final Fantasy games, ARPGs (real-time hack-and-slash combat) but with JRPG elements.
Except Kingdom Hearts: Melody of Memory of course, it's a rhythm-action game.
Y'know, I was going to bring up Virtual Quest as a comparison. I've been playing it along with Skies of Arcadia Legends.
I mean, yeah. It's a really huge stretch and that it's not a crossover game and technically part of the Virtua Fighter series. But at the same time, Virtua Quest feels mostly like it's own thing. Yeah, it takes place in the "future" of the Virtua Fighter series, but whenever I come across a Virtua Soul it's like which guest star will I meet? Sort of like in Kingdom Hearts when a new world based on a Disney movie shows up.
Other than that, Virtua Quest has its own design style that was different from Virtua Fighter 4 at the time... Sort of leaning a bit towards Phantasy Star Universe-ish at the time (including exaggerated mocap gestures). I doubt Virtua Quest is no longer "canon" to Virtua Fighters storyline.
Just saying, imagine if Sega decided to make the game where instead of Virtua Souls, it's "Sega Souls" and you learn abilities from various Sega characters. Or the Nexus consist of servers themed on locations from various Sega games, things like that.
I know going a bit off topic, it's just playing Virtua Quest gives me Kingdom Hearts vibes.