Sorry to all Lloyd fans but I couldn’t resist doing Kai and Morro, I love their parallels too much.
My interpretation of how a "Morro possesses Kai au" would be:
At first it's the usual possession but it's very violent since Kai has a bad temper. Morro agressively possesses him and breaks into Kai’s memories against his will.
But Kai is stubborn and angry and doesn't let Morro hurt Lloyd. So after the fight Morro digs deeper into Kai’s memories to see what he can use against him.
Morro finds himself relating to Kai and tries to manipulate him to betray the ninja and work with him (going as far as to showing Kai his memories)
Kai still refuses to hurt the ninja and shifts the narrative "why go after Lloyd when you can go after Wu?".
Kai basically learnt what Wu did to Morro and him and gets angry and wants to get revenge on him.
Morro is conflicted into what Wu did and his love for his only father figure. But Kai is also conflicted because on one side he relates to Morro but on the other Morro tried to use his body to hurt Lloyd. In the end I think Kai would choose his anger towards Wu and try to convince Morro even if he has to do so by manipulating him because as much as he's empathetic, he knows he can’t save Morro, and can’t get easily over the fact he wanted to harm Lloyd.
It would be interesting that at some point Morro had to fight Kai because he wanted to attack Wu and the ninja of course misinterpret it and still think of Morro as a villain.
To sum up they'd try to manipulate each other and end up exhausted from fighting the possession.
I hc that as kids the villagers tried to teach Nya how to cook ("femenine gender role") but she hated it and so Kai is the one that cooked (Nya did however the reparations in the house).
(I hc that Lloyd doesn't know how to cook either so he shouldn't make too much fun of Nya)
And as much as I love badass Nya we also need more stupid Nya.
Actually we need more stupid one being smart (Kai, Cole and Jay) and smart one being stupid (Nya, Lloyd and Zane) combos because there's a lot of the other way around in the show.