That one prisoner on the Sky Fortress

[Proswagonist]

Is it possible to save him or will he pop up later?

[Ichidoge]

I saved him after defeating the enemy protecting the core. So I think you can't miss him.

[Enfys Ellezard]

Is it The guy with Turban? You can backtrack to save him after a certain event before leaving the fortress

[Crowe]

You can save him after the ship starts falling. When you're heading up you'll reach a section with an eye beam to the right that blocks you from going right and forces you to jump up. Towards the left of the screen with the laser there's a doorway that will take you to his cell.

[No Gibs, No Glory]

Originally posted by Ichidoge:

I saved him after defeating the enemy protecting the core. So I think you can't miss him.

You can definitely miss him, which I did on my first attempt. Thankfully I still have a save on the fortress, since I felt like I forgot something important, haha. Presumably, if you don't save him, you just leave him to die. Maybe he'll pop up somewhere later and join you then, though I doubt it.

[1.2M | Missingno.]

He does still join later, you don't have to worry about missing him permanently.

[Blowfeld]

Originally posted by Indivisible Missingno.:

He does still join later, you don't have to worry about missing him permanently.

Good to hear, i forgot him on the ship

[Nymeria Lannisthor]

I suck so bad at jump'n runs i got shot into his room so i did not miss him.
and later on i had a long time to find the way out because i did not get around that core :P

to hold the jump button to jump higher is quite confusing XD

btw that is up with that fire mage who teleports away after you fre that fat turban guy?

[No Gibs, No Glory]

Supposedly (though I haven't tested it myself), you have to goad the turret near his cell into shooting a laser at the cell, freeing him. If you kill the turret first, you can't free him.