I don't know why but I don't like the "collection of bugs" reveal for Mr. N.
Like, just because something is made up of small things (and they're not THAT small, since they can be seen with the naked eye) doesn't mean it can turn into different colors/textures, move super fast, swap bodies instantly, or impersonate multiple humans perfectly. Is Mr. N even transforming? Or is it swapping skinsuits?
That being said, I know this is kind of unfair when I'm giving "huge worm can fit inside a high school girl skinsuit and take over her life" a free pass.
I think what it really comes down to, is it doesn't feel cool to me. So this is all just personal bias lol.
I think it could be good if we got more information about how it works, but it can be dissatisfying to have that dropped on us suddenly. We can assume that the individual bugs are also super powered monster bugs, at least relative to other bugs.
If they're very fast and strong bugs, they could, for instance, break off, set up a tea set using smaller groups, and then rejoin the main body.
Edit: I tried to look up what the strongest insect is. It appears to be the dung beetle, able to lift about 2/3 of an ounce or .04 pounds:
https://insecthive.com/the-strongest-insect-in-the-world-it-can-lift-1000-times-its-body-weight-post-1-3152/
I think we can grant that a monster bug is at least this strong, even if it lacks the size and exoskeleton of the dung beetle. It is, after all, no ordinary bug. 100 monster bugs therefore can lift 4 pounds, enabling them to comfortably carry a filled teacup.
Meanwhile, the tiger beetle can run 5.6 mph:
https://en.wikipedia.org/wiki/Tiger_beetle
I will suggest a monster bug can move at least this fast, regardless of its appearance. The monster bug will also need no time needed to accelerate or decelerate, ie, it can immediately go from stationary to 5.6mph and then immediately go back to stationary.
Therefore 1000 monster bugs can instantly prepare a tea set while appearing to teleport and shape shift.
I respect the research!
I think honestly, what it comes down to is a gut feeling of: I don't really like this. So everything following this is a justification of that feeling lmao.
a.) If Mr. N is a (basically nanomachine) shapeshifter, why does it need to pour bugs into Hiraizumi? It can just copy the girl's shape, right? Shapeshifter ≠ corpse puppeteer.
b.) If Mr. N is NOT a shapeshifter, but instead, a corpse puppeteer, how can it instantly swap bodies? It really is instant: one panel to the next. Plus, Mr. N's body was cremated, so it should no longer be usable.
c.) Too many superpowers: Mr. N can TELEPORT. Moving fast, sure. But it goes from the ground to the streetlamp in a blink (Ch. 16). Mr. N can stop Takahashi from transforming into a worm. Mr. N can puppet corpses. Mr. N can perfectly copy people's personalities. Mr. N can gain/lose mass with zero visual indicators. Mr. N's hive-components are super small and fast, but they're not INVISIBLE small, and using them as psychokinesis-substitutes (making lots of tea instantly) feels kind of, well. cheap.
Hmm. The more I think about it, it feels like the author is deliberately setting up false flags, and that makes the "hive-mind bug swarm" reveal feel unfair. Like signaling left, but driving right, and going "voila".
On a more positive note, seems like there's a bug-theme for the monsters and I am super onboard for that because bugs are basically superpowered aliens.