Kate, Valk or Abs, especially since none are available as 7*. But they all want sigs too.Aegon if you plan on taking on Necro someday.
honestly if you’re sweating a 6* AG, I’d second Void? he WANTS max sig, but you can work on that progressively. sig1 cuts the down time on his debuff/ damage cycle significantly (especially if you’re timing your specials), and if you’re still relying on 6* roster he’s gonna be able to do a lot of work for you.@Paul_Rudd what’s your progression level? where you at in Story? may help us dial it in for you (on top of the great current replies).