What do you think connecting to a warframe feels like? We've established (spoilers ahead) that they are all at the very least capable of independent movement and some if not all are fully conscious, so they all gotta have some brain in there. I think it probably varies from feeling like you're trying to control a wild animal to sitting down for a neeting with a really smart but scary employer, on a spectrum of Valkyr to Vauban, respectively.
We know that the original warframes were made by fitting a human with a transference bolt and infecting them with the Helminth strain of infestation. The ego of the subject doesnt seem to survive but some traces of their psyche and memories seem to be present even in the warframes that the tenno build for themselves, and I bet you can feel them in there when you transference in.
Side note, two individual copies of the same warframe meeting each other must be insane because, same brain different dudes.
im thinking it feels pretty dreamlike, like you’re having a dream that you’re someone else, or an animal?
im also headcanoning that each individual frame is unique and made of a different person as the “base” instead of being clones of an original, and i have like a bunch of different theories why they become specific models of frames:
maybe specific personality traits or talents become the basis for a frame’s model (excalibur, volt, and mag have pretty generic base traits, to explain why there’s so many of them)
the person making the frame decides what model they’ll be. might be as a punishment or something considering what happened to umbra
the only exception are copies of umbra, since they’re all basically clones from the same source. im guessing any interactions between umbras will get really awkward lol