user51: When I was asking a question about Bleach (the anime), I wanted to use/create the anime tag, as I wanted to point out that the question was about the anime and not the manga.
I got the error that the anime tag is not allowed. Which is understandable (at first), but in this situation I suppose it was legit to use!
I suppose the same goes for the manga tag..?
My suggestion is to do allow these tags, so people are able to specify/narrow down about what they are talking.
Edit: I just see that the manga tag, is being allowed?

user136: I think this is a horrible idea.  I can all-but-guarantee you it will become the most-overused and abused tags on the site.

Questions tagged anime
  This tag indicates that the question is specific to the anime version of a series that exists as both anime and manga, or movie(s).

I get that some questions are about an anime-specific version of the work —  so describe that in your question; not with tags. Otherwise, we'd have a movie tag on our Movie & TV site used only for movies that just happen to have TV versions. Sound silly, doesn't it? 
Users are never going to understand that an anime tag is only for questions that are specific to the anime-version of a series that exists as both anime and manga. Users are going to try and use this for every question that is either anime or menga.
But your can't divide a site into large swaths like this. These discussions go back as far back as our Cooking site when some folks were only interested in "savory vs. sweet" while another wanted "vegetarian vs. non-vegetarian."  The tags will convey no useful information. At best it will be a horribly incomplete categorization system.

user4: So, after conferring with the team, I changed my mind. We're going to allow for both anime and manga because they would allow for users to filter questions better, and to allow for specific canon references.
That said: I think it would be better if we treated tags the same as on Science Fiction and Fantasy, where you can just state in the question that this is about the Star Wars movie, or a specific Star Wars book, etc. The tag would be star-wars and the question body specifies canon. 

51: <p>When I was asking a <a href="https://anime.stackexchange.com/questions/37/will-bleach-air-again">question about Bleach</a> (the anime), I wanted to use/create the <a href="https://anime.stackexchange.com/questions/tagged/anime" class="post-tag" title="show questions tagged &#39;anime&#39;" rel="tag">anime</a> tag, as I wanted to point out that the question was about the anime and not the manga.</p>

<p>I got the error that the anime tag is not allowed. Which is understandable (at first), but in this situation I suppose it was legit to use!</p>

<p>I suppose the same goes for the <a href="https://anime.stackexchange.com/questions/tagged/manga" class="post-tag" title="show questions tagged &#39;manga&#39;" rel="tag">manga</a> tag..?</p>

<p>My suggestion is to do allow these tags, so people are able to specify/narrow down about what they are talking.</p>

<p><strong>Edit</strong>: I just see that the <a href="https://anime.stackexchange.com/questions/tagged/manga" class="post-tag" title="show questions tagged &#39;manga&#39;" rel="tag">manga</a> tag, is <a href="https://anime.stackexchange.com/questions/tagged/manga">being allowed</a>?</p>
 136: <p>I think this is a horrible idea.  I can all-but-guarantee you it will become the most-overused and abused tags on the site.</p>

<blockquote>
  <p>Questions tagged <a href="https://anime.stackexchange.com/questions/tagged/anime" class="post-tag" title="show questions tagged &#39;anime&#39;" rel="tag">anime</a><br>
  This tag indicates that the question is specific to the anime version of a series that exists as both anime and manga, or movie(s).</p>
</blockquote>

<p>I get that some questions are about an anime-specific version of the work &mdash;  so describe that in your question; not with tags. Otherwise, we'd have a <a href="https://anime.stackexchange.com/questions/tagged/movie" class="post-tag" title="show questions tagged &#39;movie&#39;" rel="tag">movie</a> tag on our Movie &amp; TV site used only for movies that just happen to have TV versions. Sound silly, doesn't it? </p>

<p>Users are never going to understand that an <a href="https://anime.stackexchange.com/questions/tagged/anime" class="post-tag" title="show questions tagged &#39;anime&#39;" rel="tag">anime</a> tag is only for questions that are specific to the anime-version of a series that exists as both anime and manga. Users are going to try and use this for <em>every</em> question that is either anime or menga.</p>

<p>But your can't divide a site into large swaths like this. These discussions go back as far back as our Cooking site when some folks were only interested in "savory vs. sweet" while another wanted "vegetarian vs. non-vegetarian."  The tags will convey no useful information. At best it will be a horribly incomplete categorization system.</p>
 4: <p>So, after conferring with the team, I changed my mind. We're going to allow for both <a href="https://anime.stackexchange.com/questions/tagged/anime" class="post-tag" title="show questions tagged &#39;anime&#39;" rel="tag">anime</a> and <a href="https://anime.stackexchange.com/questions/tagged/manga" class="post-tag" title="show questions tagged &#39;manga&#39;" rel="tag">manga</a> because they would allow for users to filter questions better, and to allow for specific canon references.</p>

<p>That said: I think it would be better if we treated tags the same as on <a href="http://scifi.stackexchange.com">Science Fiction and Fantasy</a>, where you can just state in the question that this is about the Star Wars movie, or a specific Star Wars book, etc. The tag would be <a href="https://anime.stackexchange.com/questions/tagged/star-wars" class="post-tag" title="show questions tagged &#39;star-wars&#39;" rel="tag">star-wars</a> and the question body specifies canon. </p>
