Thank you for this chart!
Just binged the manga after watching the anime, and this chart helped a lot with organizing the characters in my head. I have a few questions though, if you wouldn't mind answering them.
1: How do we know the hiruko form of Mako/Sachio and Taka/Mito?
2: The assumption that the two lovers Juuichi had his kid with was Nanaki and Iwa makes sense, but how do we know that the spider-like Hiruko is Nanaki and not Iwa?
3: Why is Nata/Mikura depicted as the robot in Sakota's office?
Some less pressing questions:
4: When is the second panel of Aoshima from?
5: When is the first panel of Robin from?
1. Mako likely became the Man-Eater featured across chapters 38-40 due to them having similar powers (which students and their Man-Eater forms tend to have). In the case of Mako and the blobby Man-Eater they both share the power of being able to bend and warp space. Also Mako and the blobby Man-Eater are introduced to the narrative/given focus around the same range of chapters, which Ishiguro tends to do with students and their Man-Eater forms (e.g. Kuku and Taka were also given focus/introduced around the same chapters their Man-Eaters appeared).
Further evidence for Taka becoming the bird Man-Eater is that they also have similar powers. Namely, hard-to-see speedy slashes that only go in one direction; also the name Taka in Japanese means hawk/falcon, a type of bird. Some also argue that the bird Man-Eater having a messed up head could be the result of Taka being killed by partial decapitation, but that's not quite as meaningful in terms of strength of evidence.
And some extra bonus trivia about name(s) in Heavenly Delusion, the Shinto deities Michika Takezuka and Taka/Minamikata Mito are named after/reference, Takemikazuchi and Takeminakata-no-Kami respectively, in Shinto mythology the former is known for defeating the latter (like how Michika beat Taka).
2. We know it's specifically Nanaki due to the cover of chapter 29 (that features the spider Man-Eater on the cover) having her name spelled out in katakana (ナナキ) through the broken window-frames at the bottom of the cover page. Also Jūgo and Nanaki having similar hair color and texture also serves as additional supporting evidence to Nanaki being Jūgo's biological mother.
3. Because Nata's brain was most likely installed onto the robotic assistant in Sakota/Sawatari's office. That type of robot at the Academy was never shown with the pod (which is likely a brain-container) installed on it before (Mina, the pregnant robot AI has a number of those same sort of pods installed into her main body, indicating that she is likely composed of multiple brains in addition to other elements). The cover page to chapter 52 also supports by depicting Nata placed on the part of the robot where the brain-pod is installed.
4 and 5.
They are both from this page in chapter 44