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Oouuuggghhh I can't sleep, incoherent ramble time:
Why is the Knight/Ghost so tiny in comparison to their siblings? The Hollow Knight is goddamn huge, and even the Broken Vessel is a fair bit taller than Ghost.
But like, Ghost is the same age as the Hollow Knight. Why 'n how are they so different? Like, at first I was thinking maybe it had something to do with the way the Pale King brought up THK. Cultivating THK's power or something, I dunno. But then I gotta wonder, what's up with BV? We don't really know why it's outside the Abyss; whether it's another escapee like Ghost - in which case, it would've grown to that size on its own - or they were let out of the Abyss as a potential candidate for containing the Radiance - in which case, the growth again could've been due to the Pale King giving them protein shakes or whatever. They still have a rounded face, similar to Ghost, so I guess you could say it didn't finish growing up - whether being unable to survive on their own or being killed purposefully for not being hollow.
But also, like, we see other Vessels out and about in Hallownest. Again, never made clear if they escaped on their own or were let out. But they generally seem pretty close to Ghost in terms of size. I think maybe some are slightly bigger? I'd have to look again, it's been a while. So, who knows why they're all the sizes they are.
I guess, the only other thought I had was, if you want to go with "all Vessels can get that big even without PK's help" is that maybe Ghost was dormant or something. We don't know much about what they were up to before the game started. Just that it was somewhere outside Hallownest. Maybe Ghost just took a really long nap, and after waking up, made its way back to Hallownest. Ghost didn't get big, since it wasn't eating or fighting or anything. Just conserving their energy. I rly dunno.