The next limited set's SR is water Freya. I'm not sure how good she is, but she has some fun stuff. All 3 of her skills are basically buff herself and 1 ally with something. 1st one is raise the soft damage cap on burst damage (by 250k/400k). 2nd one buffs assault (10%) and burst damage (30%/40%). 3rd one is increase burst gauge (15).
Also, said set launches with the next event.
2 months after that is the halloween limited set. The SSR for that is water Osiris. C-frame atk debuff (15%/20%) that also dispels one buff. Self-only taunt/30% reflect/regen buff. And then her 3rd skill is consume 20 burst gauge to set up a party-wide 2 turn 40% damage cut that also heals up to 1000