Hello Kat! Sirius talks to people who dislike him all the same. He takes pride in his ability to annoy the hell out of others. Clearly, agitating others while he remains perfectly calm is a super fun past time. ;]
Lisa would definitely get along with Emmeline then. :) And Sirius would probably do the same thing to her that he'd do to Astoria. He would be nice despite the trouble making! I think they could be friends- until Sirius pisses her off by being a jackass. He usually thinks of some way to make it up though. Hah. :D