Agalli could talk to Llyra, the conversation could be about how magic was developed in Llyra's birthplace (The underwater country, forgot its name x_x) which is basically for World Building.
Rallel/Sadaati or Rallel/Nilou, some backstory for Rallel or the sisters, they could talk about Rall's childhood or even about Duke Loyis.
Nobia/Lemonie, what's life like in Ampheret castle or, again, about Loyis.
Kael/Lemonie OTP
Tyren/Nilou same as above
Kael/JR, a comedy support, JR's edgy attitude and Kael's way of being would make a really funny support.
Dewey/JR, same as above, would be funny to see JR getting on his nerves.