Technichally, Tennoji was the final boss of the show, because he was pretty much the only actual "villain" left.

Anyway, I do not believe that Chase will return to being an enemy soon. Unlike Hajime, he is in total control of his powers and was a good guy in the first place, when he war Proto-Drive. So no, I don't think he will be the final boss either. Atm, my bets are on either Banno or maybe even Krim- depends on how the movie works with the show.

If Banno will be the final villain, how will gain himself a new body to fight in?

But they mentioned that Chase will play some key role in the Roidmudes master plan. That's why Brain didn't destroy him a couple episodes ago, I thought.

It is possible that he'll just make an artificial one, like Krim did in Move Wars Full Throttle. Considering his skills as AI only, it wouldn't even surprise me, even though it would be insane.

That doesn't mean he's gonna turn back into a villain...

There's an app for that.

I doubt Chase as a character will ever go back to being a baddie. His body, on the other hand. I think they've got plans for that. And I still think Banno is too mysterious and shady to be a good guy.

I've still got a hunch that Banno will use the Proto-Zero body as a host. We've seen its transformation into the Chaser forms with various aids, but I don't think Machin actually represents a real Roidmude evolution. I think there might be more to it. My thought is that maybe the naturally evolved form of Proto-Zero, controlled by Banno, will be the final boss.

Of course then they can follow through with the obvious cliche: The ultimate enemy controls an ally and becomes unstoppable. To defeat him, the consciousness of the host is strong enough to pull through just long enough for our hero to destroy them both.

I'm not liking what you said.

What if its possible if there were other "Proto-Zero" bodies that were hidden in Banno's lab once? Perhaps he'll possess one and perhaps (in my theory)....

- create his own "Brake Gunner" to henshin into his own version of "Mashin Chaser"
- transforms into a Roidmude similar to Cell as he could absorb Brain and two other lower-type Roidmudes - spider & cobra, to become complete.

And as of today, the series has completed filming.

Well considering Gaim wrapped up mid August, I'm just gonna say Drive is potentially shorter than these past few years, but only by a few episodes.