I presume everyone recalls little Faith Astor.
WoJ is that we'll see her again.
Last we knew she was going back to her unloving parents (she had described them as caring more about appearances & their image, than about her), with a bit of magic from Harry to keep her encouraged.
Herewith, I engage in time-honored WAG'ery, based upon some DF stuff on a Discord recently...
We don't know Charity's maiden name; what it it's Astor? What if Faith is Charity's baby sister?
Charity described her parents to Harry as kind of "normal über alles" appearances-first parents, so there's a reasonably-close match to our understanding of Faith's parents, with any difference being easily put down to the different POV's and perspectives of the different-aged girls.
We don't know where Charity got her talent... but presumably it was from her own mother! This, then, might imply Charity's mother could also have passed it on to her daughter Faith (n.b. names "Faith" and "Charity" being quite thematic).
So Faith Astor, when we see her again, may arrive as a full-blown Molly-caliber talent!
Now for the big leap: what if Faith is Kumori? People have pointed to some oddities in Kumori's attitudes/actions towards Harry, suggesting that if she were secretly Molly it'd explain a lot; but Faith is also likely to have (more than a little) hero-worship aimed Harry's way.