Hmm... Well, originally, I had plans for Rolen to do a lot of leading of the guild, and also for his marriage. Those plans clearly changed. I actually didn't have too many plans for him, and was going to just go with the flow of things. Maybe a marriage mid-journey, maybe having some contact with the Light Jewel, but that was it.
For Maira, I figured out her backstory during this season. I left it unspoken, though, because I thought it might come up. I had also considered letting her tap into a more offensive side of her earth magic, fueled by rage, or something of the like. It seemed a possibility, but it wasn't a definite plan.
For Kaiden, my plan was actually the opposite of Alice: Although he's a decent kid, he's a bit power hungry and the baddies trick him onto their side. That one would have needed some work, but it was plausible.
Playful and I also had an idea for a relationship between Quince and either Sola or Luna.
On the note of reacting to future technology, Rolen and Amra have already kinda done that! During the dream episode in a PM, they went to a modern shopping mall. That's how they have those Eevee toys.