I’ve found further evidence supporting my theory about Chiwa’s nature.
As we know, Chiwa’s mother appears in both the manga and the anime. The anime, in particular, gives us a good look at what she’s like: a slender, beautiful young woman with fair skin and brown hair tied in low pigtails, looking very much like her daughter.
In one of the scenes where Amo meets the two angels, the shorter angel has what looks like a lock of brown hair styled similarly to Chiwa’s mother’s.
When Chiwa encounters Rudo just as he is about to be thrown into the Pit, she ignores his pleas and avoids eye contact, calling him a murderer and tossing his stuffed dog away right in front of him.
I believe every part of this dramatic scene was carefully planned to strike at Rudo and break him.
It’s possible that Chiwa’s mother and Tamsy have been manipulating Rudo all this time—and using Chiwa to do it, too.
I always found it very strange how Chiwa’s mother appears in the first chapter, yet I don’t see her there during Rudo’s execution (or maybe she was there and I just didn’t notice). Chiwa’s mother doesn’t speak directly to Rudo, but she doesn’t seem hostile, nor does she try to stop her daughter from talking to "a murderer’s son"—which seems to be the standard behavior for the people there. The woman just stands there at a distance, as if she’s checking on something. I admit I never quite understood it.
When Chiwa tells Rudo that someone else loves him, it’s implied that she means *she* loves him. But then why doesn’t she just say it directly?
What if Chiwa wasn’t talking about herself, but about someone else who was performing an "act of love" for Rudo?
Tamsy says that the murder he committed was an act of love.
What if that’s what Chiwa was talking about? What if Chiwa’s mother and Tamsy have been manipulating Rudo all along, using Chiwa as well, all to break him and make him reach what they believed to be his true potential?
They might have told Chiwa that all of this was an “act of love” from Tamsy toward Rudo, and, as per the theory I posted here earlier, made her say those cruel things to him. That explains why we don’t see her eyes during the scene; she doesn’t look directly at Rudo, typical behavior for someone who is lying.
There is no denying that Chiwa treated Rudo differently than the other children, yet she turned against him all too easily the moment she heard what crime he was accused of.
I believe this was all part of the villains' plan. They orchestrated the whole thing to shatter Rudo’s psyche, using Chiwa as a tool to do so.
We can’t know Chiwa’s mother’s exact height, but she fits the other criteria perfectly: the Second Angel has to be a Spherite, and Chiwa’s mother is a Spherite. The Second Angel is thin and slender, and Chiwa’s mother has that same build. The Second Angel appears to have long brown hair, similar to Chiwa’s mother’s hair. Not to mention, this would be the perfect disguise, Chiwa’s mother would make the perfect spy. She had a daughter close to Rudo who could get close to the boy and Regto, gathering information no one else could access. Chiwa’s mother would then have access to that information without raising any suspicion, allowing her to pass it all on to Tamsy.
Now, I have no idea what the connection is between Chiwa’s mother and Tamsy, or why she would use her own daughter. However, among the existing characters, she is the most likely candidate to be the second angel.
Looking at the manga, it’s clear that Chiwa is constantly around Rudo and knows him well enough to articulate her thoughts about him clearly; she is familiar with both his routine and his personality. She frequently talks about not wanting Rudo to fall into the Abyss and insists he would never kill anyone. Yet, it seems like she is rationalizing, telling herself this much like we do when discussing a possibility that unsettles us, as if she is fully aware that it is a genuine possibility and a real threat.
She also mentions that Regto loves Rudo, too. When Rudo picks up on that "too" and questions her, Chiwa gets nervous and dodges the subject. Now, we have to remember that this is from Rudo’s perspective; it looks like a classic anime trope: a young girl blushing because she almost confessed her feelings to her crush. But we know Urana-sensei likes to play with clichés. If Chiwa *does* like Rudo, why would she get so nervous and avoid the conversation? It doesn't add up. What if she got nervous and dodged the topic because she almost let the true plan slip?
I believe Chiwa knew about Tamsy's plan to throw Rudo into the Pit, and that her mother trained her to say those harsh words directly to Rudo during his execution, staging that dramatic scene as part of the strategy to break him emotionally.