> I mean, do children have personalities if we left them in a dark room with no interactions with other humans?

I think this makes for an interesting discussion as I went down the rabbit hole of this which really scared me actually as these experiments are really not humane and hinder children's development so much.

https://en.wikipedia.org/wiki/Language_deprivation_experimen... : "forbidden experiment"

It depends on your use word of the personality but to measure personality would require a set of human conducted experiments or questions which would be asked through the medium of language which you've deprived the children of.

Mughal emperor Akbar was later said to have children raised by mute wetnurses. Akbar held that speech arose from hearing; thus children raised without hearing human speech would become mute.[9] The building became known as the "dumb house." When Akbar visited the place in 1582, four years after the children were first interred, he heard "no cry... nor any speech... no talisman of speech, and nothing came out except the noise of the dumb."[10]

what is gonna produce is dumbness and just severely damage children's psychology and psycho but if you were to conduct a personality test on them, you would just be measuring how much have you broken them or damaged them but in some sense, yes I do believe that they would be so broken by the person running this cruel experiment but would still have a albeit limited personality. It wouldn't be an healthy personality but it would be a personality nonetheless.

Now on the other hand, we are anthropomorphizing LLM's which yes, as they run on computer are still mathematical machines and calculations. If we consider a specific calculation itself to contain personality that is which seems unrealistic.

Another thing but the biological constraints of human (homo sapiens) made us exist in the savannah to prioritize standing up for better field of view as you stand up from the tall grasses and that led to women having smaller canals which led to babies being more primitive and relied on social cues and societies so much more which made them more flexible like clay which also created the society and consciousness revolution in the first place. (Recommend reading the sapiens book)

I am not exactly sure but there could be ways for personality/interactions for other animals as there are other animals who learn full skills after a relatively short period of time after being born but there are some innate things[0] like fear of loud noises and heights which are actually innate and could be considered part of personality even within humans, which I think can be part of evolution and part of our genetic machinery.

[0]: Interesting read: https://seasia.co/2025/07/25/we-were-born-with-only-two-inna...