Thanks a lot K1LL! Here are my opinion on each one:
Kenshi:
I can clearly understand that his purpose is sort of done, but he shouldn't leave OWIA, just because he no longer needs them. Come on, show some gratitude and plus, it gave him something better besides just wandering around the world and slaying great warriors just to build his repand pride. At least, his ancestors is leading him on the right path.
Sareena:
Now this one is interesting. This is like one of them people who struggle with their hearts. I'm glad she's trying her best staying good, but also having a hard time dealing her Demon side. She's just trying to repay Sub-Zero for what he has done for her, liking giving her hospitality at his temple. When she decided to go to the Netherrealm, she realizes the risk of what's going to happen to herself once she enters it. But towards the end, Quan Chi being a hell of a good manipulator as he is, he has finally got through Sareena's head and emotions to get back on the bad side, at least for now!
Fujin:
I'm hearing a lot of people saying that he should be the one who leads the forces of good in the previous games after he became Protector of Earthrealm. I think the reason he didn't show is because like the title says, he stays to make sure no one from other realms who has the potential of destruction enters and harms Earthrealm. If they manage to enter, he will stop them at their tracks. Very interesting about him figuring the situation with Armageddon. AT least that's a small step of taking a big role and becoming a new mentor/father figure to the good guys.
Nightwolf:
Not so sure about him. But taking a role as a spiritual anchor with Liu Kang's soul is a big thing to do for a supportive character. Hope he can find Liu's body quick and put his soul in it.
Raiden:
I feel shocked about it. How could he do this to Liu Kang? Look! Liu looked up to Raiden as like a father figure, a inspiration and look what Raiden did! He's now using his dead-roaming body as a tool of destruction just to protect Earthrealm by any means. I hope either Fujin, Kai or Liu Kang can stop him or else things might get very ugly.
To Glamador:
I think Noob Saibot still wants to rule! I think Quan Chi walked to him and asked if he can formed an uneasy alliance with Noob. Like in Konquest in Outworld in Shao Kahn's throne room, Quan Chi's trying to persuade the other evil characters into forming a temporarily alliance until they reach Blaze, knowing the risks of this truce of evil characters.