If Morro ever came back, the relationship between him and the ninja would be very complicated.
Morro, a few years back in canon, came down to ninjago to destroy it all. He came back and proceeded to possess Lloyd for the max amount of a month, and fought all the ninja multiple times leaving them almost dead. He also ended up losing, and at the end of it all it was only then that he realised it was all for naught. He could’ve gone back to Wu, but he didn’t. He chose the harder route and is now reaping what he sowed. It was at the end that he had a change of heart. Later, on the DotD, he ended up coming back and helping Wu and the ninja. Not because he’s a good person, but because he wanted to. At this point, Morro did not care for harming others nor all of Ninjago, his vengeful nature was thrown out the window.
Out of guilt and for the sake of having some form of peace, he helped the ninja by helping them remember Cole. And that was that, he immediately began leaving and was never heard from again.
Lloyd no longer is all that affected by Morro in the current time, as seen from how he casually brings him up and said to Harumi how Morro wasn’t the worst villain he ever faced. That does not mean he no longer has the trauma or the memories, but it does mean it wouldn’t leave him a crying mess if he saw Morro again.
However, he and the ninja would still be very tense and aggressive if they ever saw Morro again. They would hesitate to attack, mainly because its unlikely Morro is attacking them at that moment and because they recall the DotD. They would hear him out, maybe even ask him for help if the situation calls for it. They would not get along with him though.
Lloyd would actively avoid him, but if he ever did come across Morro they would be stuck in a tense silence, and Lloyd would be very argumentative when it came to him.
Kai would avoid him too, but if they were ever in the same room best believe those two are fighting.
Cole or Zane wouldn’t avoid him, but they wouldn’t acknowledge him either. And when they do, they’d be very uncaring? Ig? Like, monotonous, i suppose.
Nya wouldn’t avoid him, but she would always argue and cuss him out.
Jay is the one who avoids him and also never is actually stuck in a situation with him unless someone else is there.
Morro would also argue with all of them if they do, and actively avoid them all. He would start and participate in arguments too, just like them.
Their personalities and traumas would clash, and to be perfectly honest, forgiveness is not on the table when such an old would is opened back up.
However, i DO think second chances or at the very least becoming friendly with each other is on the table. Through a long journey of self sacrifice and talking because they have no other choice and through understanding they are no longer the same people. And because of Wu.
Let’s be honest if Wu (alive or in his weird orb ghost form) was there they would be a lot more cordial with each other.
But yeah, it would take a LOT to get the ninja and Morro to actually get along, but i do think it’s possible. It would start off as a huge mess for a long time, and it would probably get worse too, but eventually they would get along due to the situation they are likely to be forced into.
Like in a battle, or someone sacrifices themselves for the other, or they get into one of those cliche situations where two of them are stuck in a room or smth together and they have to talk it out or they’ll go insane, or they have an argument that no can stop or they can’t just run away from and end up spilling how they actually feel and shi.
I am TELLING YOU. It would take all those cliches to make them get along.
OH LIKE HOW ZUKO DID WITH THE GAANG THATS HOW.
It would take Morro proving himself to have changed for any of them to get along. But knowing this guy he wouldn’t try and it would happen by accident.
I’m using Garmadon and Harumi as examples as they both were horrible people who hurt Lloyd and the ninja a bunch, but they gave them both a second chance and Lloyd (somewhat) forgave them both after they changed and proved it. I think it is possible the same could happen with Morro, because they’ve done this multiple times. With Harumi, Garmadon, Pythor (still became evil again tho), Skylor, Pixal, and so on.
Another reason why is because each of those characters had a unique connection with another ninja or someone in their group. Skylor with Kai, Pixal with Zane, and the other three with Lloyd. Who does Morro have a relationship with? Wu. I find it likely that with Wu supporting Morro the same way those three did with their ‘villains’ the others would be just a tad more willing to at the very least hear him out.
So pretty much the relationship between Morro and the ninja is like a married couple about to divorce because they were in a shi situation and Wu is the marriage councillor who’s doing his best.
Sorry i was just thinking about how they could actually get along man and i trailed off on to this, forgive me 🙏