These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ensemble Darkhorse: Tagosaku, Kouki's oddly-faced friend. According to the mangaka, she had been drawing him since grade school, particularly at the request of her friends, and some fans had written her about how some of their male classmates would draw him in the margins of their notebooks.