allie: oh, he is definitely a regular. another cheery person and cia grad to make his baked good dreams come true? he doesn't really like sweet things, but please stuff ALL the bread/savoury pastry into him, allie. he has joked that he would like to marry her before, if only so he gets free bread. he is also not immune to cute animals, so if he knew what she was he'd be charmed.
mal: he does like to read! i could see him poking around there every once in a while. he is amicable enough that they have probably have had a few long conversations about random topics while he's visiting.
mandy: there is so little food that is not his food, mandy. greasy spoons are no exception. re: selling her blood, there's a couple ways we could play that! because yes, he'd def pay for that! and if he ever figures out it's her (by smell alone or some other way) he'd approach her cut out the middle man and make an arrangement between just them for feeding. he's a very polite, non-messy eater, he promises.
sebastian: how well known would it be that he turned heel on his sire or the circumstances around it? jiang is still deeply deeply devoted to arden even after centuries of new children (and have you SEEN the mess that's jinhae, he says!) so he will not understand that at all. possibly still makes jokes about it. but they'd probably have crossed paths a lot, as jiang was always orbiting arden even when he was still emissary. he'd like to be friends!