Fun fact about Fire Emblem Engage, while there's no data that really implies they were meant to be playable at some point, both Queen Ève and King Morion do have a fully working voice set, just no Engage related lines.

Here's a video showcasing their critical hit quotes. pic.twitter.com/8dcM5H0hZC

— DeathChaos (@DeathChaos25) February 9, 2023