comment: >
  
  Which character are you referring to?
context: The Game of Thrones character Margaery Tyrell is canonically 16 years old. However many people felt attracted to the character after watching GOT. At first one might brush this off as disgusting pedophilia. But upon closer expectation, in the TV show Margaery was played by Natalie Dormer, which at the time of recording was 30 years old (and definitely also looked adult). Furthermore Margaery is a well-spoken, confident and headstrong woman. Hence, Margaery, despite technically being 16 could reasonably be anything between 20-35. And people were not attracted to her because she was 16, but quite the opposite because she was displayed as adult. 
  That is the difference between the book age (the age a character technically has) and the displayed age (the age a character could reasonably have, given their looks and behavior). 
  The same principle applies to Anime, just much more pronounced. The reason for that is that Anime is hyper simplified, meaning there is basically no optical indicator of the age of a character. So the audience could reasonably assign any age between 12 and 30 to a character. This is for example what happens to Marin Kitagawa or Hitagi Senjoigahara (and many more). Despite being 15 and 17 respectively, if you just in your mind change the setting from high school to college, boom, they are 24.
  Edit and post scriptum: 
  I am going to separate this from the main argument above, simply because I think the above is neatly closed in itself. However I also want to argue, why for Anime viewers it does not feel weird or forced to view Anime characters as older as they technically are:
  If you see your high school crush for the first time in 10 years and you feel the hots hitting you again, I don't think you have to be afraid to be a pedophile, because your attraction to a person originates from experiences with their underage self. You are attracted to a person which was the same age as you and by the continuity of the self you still identify with your younger self. 
  The same thing applies to Anime characters. People that watch Anime usually start watching Anime when they were teenagers. At this time they felt attracted to a character that then was the same age as them. When they now still feel that attraction, they do so because they still identify with their younger self. Unfortunately in contrast to your high school crush, where this mechanism felt very natural, the Anime character has not aged along you, making it now technically pedophilia. 
  You might now interpose "Yeah, I can see that with the Anime characters when you were younger. But what about the anime characters you watch now? They are clearly younger!". I again want to apply a continuity argument. I have been watching Anime since I was 14, roughly on a monthly basis. Every month I got the reassurance: Last month these characters I see were roughly my age, so surely one month later they still are. I am now in my mid 20s. And yet, I don't feel a gaping age difference between me and the characters. I guess, in my mind Anime characters are hardwired to be my age by default. In my mind, anime characters (even new ones airing now) have always naturally aged with me.
  (All of this allowed btw. by the fact that in Anime there are barely any markers for the displayed age of a character). >
  
  
  No optical marker for the age of a character
  
  This is a frame from an infamous comic. The female character is supposedly 18 and is in an intimate relationship with the male character. What do you think?
  I think when people describe it being weird, they're referring to this kind of character, not the ones that you linked which can pass for 12-30 years old. The character Bocchi that OP is referring to also does not pass for above 18. 
  That's why it's weird. >
  
  Honestly that is a perfect example, from the picture you could say that character was 25 and I'd believe you.