I think that the fact that these games must first construct and design a large number of playable characters before balancing the game around party combat is the reason why these games are less complex. The game FF16 has already shown that it is not that.
Sora still has a strong set of mechanics and skills in the Kingdom Hearts games, which makes experimenting with him a ton of fun and variety. KH, a single-player action JRPG, is already known to include FF16 support.
Clive, as the only playable character, has the same opportunity. Based on the video, we know he can do air juggles and teleports like Vergil and has a bringer option like Nero. That's a great place to start! According to the most recent one, he can perform Air Stars while wearing Shiva's shroud. There are still 5 Eikons