Is it even confirmed that the 6th ranger will be Kumo/Spider-themed?

Yep. We saw a Spider outline with the Kabuto, Scorpion and Hopper-glyphics.

But will the spider ranger come from Terra or our world? He'll obviously be antagonistic to the Bugnarak & all the kings in general. Later, he'll team up with the five rangers against Racules & the Bugnarak.

Do you see him being Gira's future retainer? Cause he's better off as a comrade & partner to him.

I think Spider Ranger will be from Terra, but which country is the mystery. Maybe he met his crew in the Gokkan prison and they worked together to escape.

When he inevitably warms up to the King-Ohgers, I doubt he'll ever be willing to bend the knee to them, as that would go against his chaotic ideals. They'll be equals.

I see.

What if it wasn?t Gokkan. Probably from a place outside of the map.

He could start off a slave and escaped becoming a member of a rebel/anarchy group who seek to rid the world of rulers. For that, he builds his own crew who'll accomplish it.

And you're right about the sixth ranger being equals to the 5 rangers. He'll hang around anywhere to make up for his sins and yet still remain chaotic, mostly hanging out with Gira and the orphans.

What if Kumo might have something to do with the killer of Himeno Ran's parents?

I'd imagine the sixth ranger would be at the same young age as Gira or as Racules and the others.

It all depends on how old he is.

He could be around Himeno's age at the time with that group.

If King Ohger gets adapted into Power Rangers, what if they changed the morphers like with Ninja Steel?

Their morphers can be original and based off of the Beetle Bonders/Data Bonders from Beetleborgs.

The chances of Power Rangers being adapted from Sentai again are pretty much 0%