Siobhan: Telekinesis. Not strong on precision, but very big on destruction. Mainly along the lines of Crush, AOE TK Wave, Grip and Choke.
Sumiko: Illusions, is learning Sith magic
Kaida: Cryokinesis and Alter Environment
Elpsis: Pyrokinesis and Alter Environment, empathy
Tarissa: Pyrokinesis. Not much of a fighter though.
Enyo: Doesn't have a specialisation since she only just learned she's a Forcer. But she's Sio's clone, so she may go in a similar direction, just more surgical and less focused on mass carnage.
Naamah: Used to be good at Force Stealth and Drain Life, but I booted her down to Padawan for IC reasons, and she doesn't use the Force much now, beyond basic stuff like enhanced speed and improved aim.