Jefferson is what keeps Emma sane. He's been there every step of the way, giving steady, sometimes brutally blunt, advice. Emma's more than sure she's never cared for anyone other than her son the way she does Jefferson.
Having been through the worst possible scenario with Killian, Emma is hard pressed to trust anyone more than she does Killian. Which is with her life, possibly with a lot of lives. She's found he's an exceptional friend.
A ray of sunshine in a hellhole of darkness, Ruby is almost the closest to family as Emma has left -she'd say like a sister, but probably a really close aunt. Ruby is a great shoulder to lean on, and really good at distractions.
While she's only known him a short while, Garrett is definitely a fun, easy going guy that Emma enjoys spending time with. With him teaching her magic and her hopefully helping his culture adjustment, that's a good thing.
While prickly at first, Emma found a fairly good friend in Rosalind once they came to an understanding of safety measures. Time in the lab is usually quiet and easy going, making a comfortable friendship easy.
Emma and Robert bonded during a near death experience with a dinosaur and collapsing building. While Robert was idiotically chivalrous and took the brunt of it, Emma found it stupidly endearing and likes to check in on him.
Leslie is a strange creature, she's enthusiastically energised in the face of everything, and while Emma greatly admires that, she's waiting for the crash to happen. Leslie is near impossible to hate though, and her energy is infectious.
Owen is refreshingly up-front, to the point and sensible. Emma really appreciates that lack of bullshitting and his extensive training skills in a tight spot. He's got a good head on his shoulders, which Emma thinks will be helpful a lot.
Like Owen, Claire is fairly to the point of things, she's much more organised and no-nonsense than many others, attacking problems head on. It's a great skill, one Emma's pretty sure will be invaluable, especially with crisis plans.