They are both two of my favorites. Ed didn't interact a lot with Bonnie, but they were on clean up together after a battle with goblins, so he has some respect for her. It was a dirty job.
Besides working together, he'll be curious about Chloe because he's met a version of her roommate. They tended to argue since Ed definitely believes he is who he says, and is very wary of him.
Mordecai will back off if given a hint, too. The flirting is habitual. The only person he was ever serious about he bickered with constantly, but he also had reason for trying to keep her at arm's length. Mostly the fact that he was serious, and he isn't really safe to be serious with. He's curious about magic and other worlds because he's traveled to many of them as a part of his job at home.