I’m writing my first story and almost all of my MCs are of different races.
I agree that a lot of authors play into racial stereotypes; if and when they actually have a poc. I (am white but) find it completely abhorrent. I hate the “she’s black, loud, rude and blah blah” or “meet the Token POC, that’s also gay and obnoxious, and the MCs one-sided best friend” shit, too.
The summary is of my characters strengths and flaws in the story I’m currently working on. It’s a sort of who done it… read if you feel like it. LOL if not, stick to my comment above LOL 
Summary
Calliope is latina/black, Cristina is Asian-American, Parker is Irish-American, Lola and Avery are white.
Calliope is a smart, secretly nerdy, popular girl (SMART “NERDS” CAN BE POPULAR,TOO! js! I am tired of seeing the “nerdy girl gets pretty and popular but before she was picked on and depressed with a crush on the cool guy” cliche. I’m over it.)… she has a tendency to hide her intelligence around certain people; although she is in fact intelligent (both academically and she picks up on other peoples intentions quickly.) She does have flaws, though. She’s all about being seen as perfect and fitting in to almost a pathologicial degree (this is due to the fact that as a youger girl, she was a little big,nerdy (can’t show it because of the limited facial and body types) and always felt like an outsider- even with her friends…), and since her parents’ divorce and her mother’s remarriage to a man with (in Callie’s eyes) a replacement daughter, she is constantly doing things to get attention that she shouldn’t do. (as most children in divorced homes do. speaking as one.)
Parker is of average intelligence, athletic, and almost too nice. she tends to go along with whatever people want her to do…which again, causes problems of it’s own. She, throughout the story, discovers her own sexuality and deals with the issues associated with it.
Avery is a very type A perfectionist, which is a strength and a flaw on it’s own. She has the perfect older sister and no matter how good she is, she can never really top her , her parents aren’t the warmest and have their own secrets to deal with.
Cris is artistic, kind, and feels her emotions deeply.She’s the one that tries to keep everything together even when they are falling apart, sometimes to her own detriment.
Lola is the Queen-B. She’s pretty, popular and mean… she uses secrets,lies and threats to get her way. Her one redeeming quality is that she will do anything to protect the people she loves. Her murder sets everything in motion. Is she really what she seemed?