From what I heard, current DMM meta is Pirates >> Archers. Take it any way you want
Thetis and Dahlia, with Thetis being a bit higher in priority due to -1. You may leave Kerry at CCmax for the situations where you can't deploy Thetis fast enough, or raise Emilia to CCmax for that role, should you manage to min-cost her, but I'd keep in mind Mischa's release after the takeover to fill the cheap valk role here
ЗЫ. Emilia's AW passive is 15% chance to nullify incoming blow, same as Maribel the early event plat heavy.