I personally don't think Misako deserves the attention she gets. She abandoned Lloyd at a boarding school for evil kids, knowing that he was supposed to be the Green Ninja, and even then it was just a hunch! What if he hadn't turned out to be the Destined one? What if he was just a kid? Plus, she technically didn't even apologize. She still hasn't. And she did all this without Garmadon's knowing. She cheated on him for Wu. HIS BROTHER. I'm gonna be honest, if my wife did that I'd kill her. I think she should have gotten killed on the Island. I really hate her.
Koko is a different story. She's supportive of Lah-Lloyd and is honest about her feelings about Lord Garmadon. She's strong and smart and as she actually took care of Lah-Lloyd with Garmadon's knowing and consent. They agreed it was better Garm was out of the picture. And she kept Lah-Lloyd in her care unless he was with Wu. She's way better than Misako in my eyes.