You know I could swear I replied to this, but I guess I didn't.
I would say that Darian rarediamond would be irritated by her, but would act nice to her face... as he's polite like that.
Hatter would probably be irritated by Rose also, but he sells to everyone. Hatter would LOVE Sebastian! And personally in a few months I'd like to see him slowly turning into a Tart... so we'll have to talk about that ;p
Darby graspednettle would be off put by both, but I could see her admiring Sebastian from afar as she likes watching dangerous things, but hasn't had a chance to go to the Caucus Races.
And Penny- my oyster- redcloak will likely try to be friends with both, because she likes people and that's just who she is. If Sebastian is in a good mood, she'll likely latch onto him since he's from the Upper World and is getting along fine here.