user274: Some anime and manga series have multiple continuities, such as Fullmetal Alchemist (the manga and Brotherhood follow the same story while the original was only partly based on the manga) and Evangelion (the Rebuild continuity has strayed completely from the original anime, and the manga is completely different also).
I read through this question, but it mostly covers multiple tags for different parts of the same continuity.
So, what I wonder is: Should we have tags for each separate continuity? Such as fullmetal-alchemist and fullmetal-alchemist-brotherhood; neon-genesis-evangelion and rebuild-of-evangelion; and so on? This answer seemed to suggest we should, but no changes have been made to questions pertaining to FMA: Brotherhood; should they be?

user27: I think the answer here is "it depends".
Are the very significant differences between the versions of the series? Plot-wise? Character-wise?
In the case of fullmetal-alchemist, yes, there are. However, because the manga is called Fullmetal Alchemist, while the "original" anime is called Fullmetal Alchemist: Brotherhood, I'd argue it would make more sense to have a fullmetal-alchemist for the manga and brotherhood, and a fullmetal-alchemist-2003, for the 2003 series.
However, these cases should be handled on a case-to-case basis. If the variations are fundamentally different, yes. There should a different tag for it. Where the most "popular" tag (fullmetal-alchemist is considered more popular than fullmetal-alchemist-2003 in this context) goes to the canonical, official series.

user93: For Fullmetal Alchemist, having separate tags for fullmetal-alchemist and fullmetal-alchemist-brotherhood would get really confusing. Fullmetal Alchemist (the 2005 anime) is different from Fullmetal Alchemist Brotherhood, but Fullmetal Alchemist (the manga) is essentially the same as Fullmetal Alchemist Brotherhood, so that will lead to a lot of problems. As said in Regarding tag sprawl, it can just be clarified in the question which one is being asked about. 
For Neon Genesis Evangelion, and in general, I think having a policy of fewer-is-better should be used when regarding tags. It can be clarified in a question what is being asked about, just as it can be clarified whether a manga or an anime is being asked about.

274: <p>Some anime and manga series have multiple continuities, such as <em>Fullmetal Alchemist</em> (the manga and <em>Brotherhood</em> follow the same story while the original was only partly based on the manga) and <em>Evangelion</em> (the <em>Rebuild</em> continuity has strayed completely from the original anime, and the manga is completely different also).</p>

<p>I read through <a href="https://anime.meta.stackexchange.com/questions/212/should-we-have-separate-tags-for-the-dragon-ball-series">this question</a>, but it mostly covers multiple tags for different parts of the same continuity.</p>

<p>So, what I wonder is: Should we have tags for each separate continuity? Such as <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist&#39;" rel="tag">fullmetal-alchemist</a> and <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist-brotherhood" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist-brotherhood&#39;" rel="tag">fullmetal-alchemist-brotherhood</a>; <a href="https://anime.stackexchange.com/questions/tagged/neon-genesis-evangelion" class="post-tag" title="show questions tagged &#39;neon-genesis-evangelion&#39;" rel="tag">neon-genesis-evangelion</a> and <a href="https://anime.stackexchange.com/questions/tagged/rebuild-of-evangelion" class="post-tag" title="show questions tagged &#39;rebuild-of-evangelion&#39;" rel="tag">rebuild-of-evangelion</a>; and so on? <a href="https://anime.meta.stackexchange.com/a/88/274">This answer</a> seemed to suggest we should, but no changes have been made to questions pertaining to <em>FMA: Brotherhood</em>; should they be?</p>
 27: <p>I think the answer here is "it depends".</p>

<p>Are the very significant differences between the versions of the series? Plot-wise? Character-wise?</p>

<p>In the case of <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist&#39;" rel="tag">fullmetal-alchemist</a>, yes, there are. However, because the <em>manga</em> is called <strong>Fullmetal Alchemist</strong>, while the "original" anime is called <strong>Fullmetal Alchemist: Brotherhood</strong>, I'd argue it would make more sense to have a <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist&#39;" rel="tag">fullmetal-alchemist</a> for the manga and brotherhood, and a <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist-2003" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist-2003&#39;" rel="tag">fullmetal-alchemist-2003</a>, for the 2003 series.</p>

<p>However, these cases should be handled on a case-to-case basis. If the variations are fundamentally different, yes. There should a different tag for it. Where the most "popular" tag (<a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist&#39;" rel="tag">fullmetal-alchemist</a> is considered more popular than <a href="https://anime.stackexchange.com/questions/tagged/fullmetal-alchemist-2003" class="post-tag" title="show questions tagged &#39;fullmetal-alchemist-2003&#39;" rel="tag">fullmetal-alchemist-2003</a> in this context) goes to the <em>canonical, official</em> series.</p>
 93: <p>For Fullmetal Alchemist, having separate tags for <code>fullmetal-alchemist</code> and <code>fullmetal-alchemist-brotherhood</code> would get really confusing. Fullmetal Alchemist (the 2005 anime) is different from Fullmetal Alchemist Brotherhood, but Fullmetal Alchemist (the manga) is essentially the same as Fullmetal Alchemist Brotherhood, so that will lead to a lot of problems. As said in <a href="https://anime.meta.stackexchange.com/questions/222/regarding-tag-sprawl?lq=1">Regarding tag sprawl</a>, it can just be clarified in the question which one is being asked about. </p>

<p>For Neon Genesis Evangelion, and in general, I think having a policy of fewer-is-better should be used when regarding tags. It can be clarified in a question what is being asked about, just as it can be clarified whether a manga or an anime is being asked about.</p>
