Ooooh, heylo! New interest! We's raking it in. lol Kinda sorta, maybe, not really.... >.>
I don't have a character who could personally help, although the fellow I'm making for the Fatanen Party could potentially have tracked your runaway, if indeed they did run away. Beyond that, you've got plenty of options. :) Provided I'm reading things right, anyway.
@Thought Manifest Nieri has helped at least two of the characters escape already, so she's certainly available for others.
@Beckett Hue is coming from Eriston, where his family might have kept a slave, and possibly brought them with him when he went off to 'help' the resistance. Though I'm not sure because of his Calva heritage.
@Rainjay Shale did travel extensively and may have tried to help out the Calva slaves at one point. Either through buying or helping them escape, but I'm not sure if they'd have been doing this very frequently after the Uialien genocide. :/ Which would make timing a little awkward. heh
@Sarcor Dolf might also be a possibility for buying a slave to set them free or helping an escapee, he seems inclined to help that way, but with the recent troubles, he might not have. Though possibly anything to get back at the Fatanen. :P Or, he might just have wanted some help carting things around while exploring Aliudea.
@Torack Eovaine has also travelled a bit, and worked for the resistance, I cannot remember exacts, sorry, but I think I remember possibilities that might be made into opportunities.
If I'm utterly wrong, apologies to everyone involved for misreading things.