Thanks Misaki, I think I've watched that before but I'll check it again.
Nate, in my games there's only a single json sprite/skeleton chosen to draw per character object, depending on their direction, as shown in the Create Event screenshot. Above the VS is the single skeleton/json sprite assignment and below the VS are the multi-skeleton/json sprite assignments, which are what I'm going to switch back to trying. Do you know of any issue doing this?
I'm not sure about trying to combine multiple jsons for a single character... sounds like a multi-headed hydra type boss or something lol.
I'll let you know if I see any visual issues (i.e. animation jumps when the json sprite changes), but from what I remember when I first tried it, the animations blended fine when changing from json to json as direction changed.