I don't know where Miura is going with the Gaiseric lore at all; I've heard that the timing is off for SK and Void to have anything to do with the First Eclipse and Gaiseric but I'm just not sure. What I will say is SK reminds readers of Gaiseric and SK reminds Puck of a fairy. SK is on Elfhelm...
When it comes to Casca's feelings towards Griffith/Femto I think she will want to return him to normal or to separate him from the Moonlight Boy/Cursed Child. The Child itself will likely be a blessing and a curse. Speaking of which he should be on his way to Elfhelm since last we saw Griffith...