Anyways this is based off their skill set from what we got. I would assume that the UC would have a neutral personality, an eldritch toddler basically. One that mimics what it knows and what it observes. It's mostly (if a seperate entity itself) in the oven the whole time.

So It would have learned from Dark enchantress, mimicing her ideology and behavior, or at least mimics her intentions as it's own or maybe going off instincts or commands?

Perhaps even continuing with these commands because it just doesn't know better. But we could also assume it knows what good is.

Wind Archer did shoot or pierce the darkness, so the UC could know what things that are pure and good are. Would it be more incline and in turn search for that good feeling once more?

Idk this is all assuming this thing has reason and is perhaps smart enough to have morality or even have its own goals or ambitions, that too.

Theres always the option it could be empty or evil based on feelings and lack of free will or just evil on its own motivation and ambitions