Emma is the blonde girl in the middle, not much is known of her except that she hangs out with Heather. There have already been enough spoilers about some characters so I'll let you get to know them for yourselves, from now on. I am really excited about this game, things will be done at a slower pace and in more depth while also bringing as much content as possible. I'm sure that you're going to enjoy it once it becomes available, which is in about 3 weeks!
Have a great day!