ARR: Lahabrea, Jacke, Brithael, Gaius, Livia, Riol.
HW: Regula, Varis, Ysayle
SB: Hien, Yotsuyu, Magnai, Daidukul
ShB: Emet-Selch, Thancred, Vauthry, Ardbert
EW: Jullus, Hythlodaeus, Sicard

I'm likely forgetting someone and any character mentioned can typically carry over into subsequent expansions if and when they have additional scenes.