FanficRecs Silvering the Fourth Wall
This work does something with the fourth wall that is very rarely seen in Anime fanfics. For that matter, it is very rarely seen for anything besides the Harry Potter books, specifically. What it does is have the characters watch the anime that they are a part of. No more, no less.
Since the characters at no point acknowledge themselves to be fictional, or even the existence of an audience, this is *not* breaking the fourth wall. While lampshading is present, it is not primarily that either. It is not a literary agent hypothesis, a "and that person is me", a fourth wall mailslot, sitting atop the fourth wall, or anything else that I've heard of or is present on this site.
I propose a new name for this type of metaphysical fanfic: "Silvering the Fourth Wall". ('Mirroring' just sounds worse). This occurs whenever characters read their own book/comic, watch their own anime/cartoon/show/movie/musical, play their own game, or anything of a similar nature......but do not explicitly break the fourth wall by referring to themselves as fictional.
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Having said that, this work is also very good in its own right. There is a definite larger plotline, rather than simply "what fun can we have by watching these episodes"? Everybody stays in character, but many background events are filled in. It updates frequently, about once a week, at over 10,000 words per update! It is at various times entertaining, funny, sad, and even talks about some big ideas. If "Silvering the Fourth Wall" ever becomes a commonly accepted fanfic trope (it totally should!), this story will be the gold standard.
FanficRecs Depends on your ability to accept the bad in favour of the good
I don't really know what to say about this fic. On the one hand it has some genuinly funny, sad and enjoyable moments and I like the concept (plus it has some interesting headcanon ideas), on the other hand a lot of the reactions feel at least somewhat forced, the arguments quickly grow exhausting as they're repeated over and over agan and the characters seem to feel the urge to play Captain Obvious at times (and not the funny kind of Captain Obvious) adding to the forced feeling.
I suppose it really depends on how well you can tolerate repetetiveness and how much you like the concept. For me the reactions to the actuall episodes are just enough for me to overlook the stuff that annoys me.