

As Syd says, his mother dies and his father, who is a mad scientist abandons him. Unfortunately what happens next is not so happy. The message in the lab about there "having a way to return to our time corroborates it - it would be really "their" time if she ended up with Giro, right? So most likely what happened there and more thematically appropriate that is he DID come back to her which is a bit happier ending. Given that, I don't think he would want to worry his friends and do something stupid such as wait forever in the anomaly. Based on this, I feel we can assume that Kuro is not evil. This does not prove Kuro was not Giro, but that they are different? Definitely if you ask me.

Which Ceres might as well be, given that initially she says she's going to "destroy time", for which it's unsurprising that everyone would oppose her, not just Kuro. Unless you are an extremely terrible judge of character. I'd imagine it is pretty difficult to think that of someone who, if he really is Giro, has killed your parents and subjected you to torture, proving himself ruthless in every way possible. More importantly is the fact, that no matter what, she believes that Kuro would understand and want to help her. The future Ceres knows who he is even before regaining all of her powers. But she outright asks you "Are you here to return me to Professor Giro's lab?" Especially considering how she has her powers, even if they were drained. Regardless of the writing, if it's of any quality, there's no reason she should not have recognized him as Giro when you come to the lab the first time and see her. But things might not be necessarily as dark as you imagine them. Kuro being a completely silent protagonist outside of when he activates the weapon doesn't help either. Personally I feel one should not chalk it to extra foresight when it could be explained by either silly references or laziness. Nah, it's far too ambiguous to fully understand.
