Alright, so I'm slowly pieceing together what we've now seen of Asura and what the director said earlier that it was their fault she killed herself and that "her just existing was a sin they're commited". And of course, Asura looks kinda like an alien.
What if Asura is half-human, half-whatever-it-is? Like, researchers, adults, somebody cross-bred the being Asura came from with a human to make their own little hybrid and test how it develops when raised surrounded by humans (more or less)?
Asura (and Kona too) seem to have both a little bit of clairvoyance and a bit of reality-shifting ability. She might've killed herself, because she saw her future. Maybe it was just gruesome, maybe the adults, researchers, some psychos were going to use her or splice her "alien" DNA to make more unnatural children?
She told Kona she understood her role and then commited suicide, so this would add up, right? And when Kona said they're gonna kill Tokio like they killed Asura, he probably wasn't literal too. If whatever the adults planned pushed Asura to killing herself, he (Kona) might feel like the adults have some dangerous plans for Tokio too.
Also, how TF people are still confused that Tokio is a girl? I know, young kids sometimes look both feminine and masculine at the same time, but y'all literally saw those girl's breasts last chap xD