User blog comment:Angel Emfrbl/Canon versus Headcanon/@comment-26192563-20150430154259/@comment-53539-20150501090333

I've seen the same in every fandom, so its a universal problem.

Unfortunately a lot of the problem is that the 2D fanficiton gets popular, even though its a poor example of its type of characterization. So that poorly written Rin x Len fanfiction will get a lot of interest despite its poor and a piece someone put a lot of effort into might not. :-/

This is kinda why characters tend to be formulaic in TV shows and stories to begin with, because the audience doesn't always grasp a character fully. And not only that, they can miss the times the character changes in personality, unless its to the extreme (going from good to bad or vice versa). The majority of series primary start off with the first handful of episodes setting up a characters basics for this reason, and will repeat this every other season to remind viewers and inform newbies, who a character is.

The more formulaic a subject is, basically, the easier it is for a audience to grasp and write stories around them. If a plot line or character is too complex, it confuses people a lot. So a lot of script writers get stuck with this balance of development of cast/story and trying to keep things simple. Sometimes, it just doesn't work and other times, they pull it off. :-/