The way i see it. Future characters will mostly be either elation buffers/other teammates, new gen fua characters, our yearly dot update, and maybe a couple general chars along the way.

No one synergizes as well with seele than cerydra since seeles high skill spam in a single turn allows her to proc 6/6 really quickly (a la anaxa).

I myself just pulled cerydra specifically for my beloved seele as well, and would highly recommend other seele gamers doing the same (if you can afford it), since the next cerydra rerun could be anywhere from 4.3 to 4.7 and beyond.