First, another glimpse of the Alfred and Céline from the other Elyos:
I had a suspicion, but this confirms that Céline’s retainers and also her mother, Ève, are dead. In the trailer, there was a distinct lack of retainers. So I imagine most of–if not all of–them are dead already.
Since the Fell Xenologue tells a more compact story, it makes sense to limit the number of the characters, since we’ve already got Alear, the dragon twins, Four Wings and 8 royals, at least.
Next, the Four Wings, starting with Zelestia:
Zelestia (VA: Rika Fukami) is the leader ofthe Four Wings. She’s a mage dragon who’s lived for millenia.
You may recognise her line from the trailer. Because the Fell Xenologue occurs after Chapter 6 (when you unlock the Ancient Well), Alear has already met Zephia by then.