The other half of isekai tropes is "register at the adventurer's guild, get a rank (something like B or Silver), take odd jobs, get a character sheet based on explicit analytical magic". These mechanics are more MMO in feel, although I don't know which MMO was the first to make it big in Japan. They're also leaking into other types of fantasy; it's the whole setup in DanMachi, for example, but that show has no Earthlings in it. Same with Goblin Slayer, and probably a bunch of others.Aren't most of the foundation of JRPG isekai just straight up the first Dragon Quest? Unless you're thinking of something beyond the "evil demon lord who needs a chosen hero to stop them?"