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.
Similar to previous waves, Wave 4 will be available at the start of the next month: more precisely, 5th April 2023.
In addition, Nintendo Japan and the Fire Emblem Japanese Twitter shared additional information.
First, here’s the official artwork for the two new characters, Nel and Nil. Plus their profiles.
Nel (VA: Romi Park) is Nil’s older twin sister, a strong woman who fights alongside her brother. Together with the summoned Alear and Nil, she embarks on a journey to collect the 7 bracelets to save the world.
Nil (VA: Takuya Eguchi) is Nel’s younger twin brother, a kind-hearted young man who assists his sister. He feels ashamed that he’s not as talented as his exceptional older sister.
In the Japanese version, their names are El (Elle?) and Il.