I've been thinking about the Seven Sisters. What makes them sisters? They all have different fathers.
We could say that they are all born from Halina. Of the ones out there now, Sela is a Lesser Goddess, and the others are demigoddesses. Also, Sela has no father at this time.
So, let's say Gundar is Sela's father, and she was born first, and that's why she's Lesser and the others are Demis.
At this time, the Seven Sisters are:
Sela, LN, stonework and community
Phyrah, N, wind and travel, Verdante's daughter
Shurassa, CN, storms and rest, Delanor's daughter
Russna, N, wisdom, Antonidas' daughter
Ulura, N, moon and lovers, Hyrag's daughter
I definitely think Ayratha (LN, fire and transformation, Chennet's daughter) fits into this group perfectly and is one of the Seven Sisters. This leaves one more, probably not worshipped much. We also need to keep the theme going with another father, and a neutral alignment like the others. For balance, I'm thinking CN.
So... how about Taurusk's daughter? It's just a thought now, but I'm thinking Sarcacha, demigoddess of free will, the overflowing fountain of raw potential and brutality. Something like domains of Chaos, Animal, Madness, and Liberation. Worshippers include artists, berserkers, and anyone willing to relinquish control to gain access to power. She screams incessantly in a thousand tongues of the way things might be, the way things are not, and the way things should have been.