Gargron

This widget shows all tags that are anime titles as a dropdown menu. It creates a taxonomy called Anime, you only need to tag your posts not in the ‘Post Tags’ box, but the ‘Anime’ box.

Anime Dropdown Widget

This widget shows all tags that are anime titles as a dropdown menu. Using WordPress' custom taxonomies.

BjornW

Add tags to a Page just as you would do with a Post.
This plugin adds the ‘post_tag’ taxonomy to the Page post type. 
This enables the tags metabox in the New or Edit Page interface. To show tagged 
Pages on a tags archive page or in a feed, it uses the ‘pre_get_posts’ hook 
to change the post_type query parameter to ‘any’.
The plugin has no settings, does not alter the database and only uses hooks to 
achieve it’s goal. It also should work perfectly fine with Multisite installations.
If this plugin meets your expectations and you use it commercially 
please consider a donation to one of these organisations or your country’s equivalents:
<ul>
<li><a href='https://www.msf.org/' rel="nofollow ugc">Medicines Sans Frontiers</a> </li>
<li><a href='https://fsfe.org' rel="nofollow ugc">Free Software Foundation Europe</a></li>
<li><a href='https://https://www.bitsoffreedom.nl/english/' rel="nofollow ugc">Bits of Freedom</a></li>
<li><a href='https://edri.org/' rel="nofollow ugc">European Digital Rights (EDRi)</a> </li>
<li><a href='https://fsf.org' rel="nofollow ugc">Free Software Foundation</a></li>
<li><a href='https://eff.org' rel="nofollow ugc">Electronic Frontier Foundation</a></li>
</ul>
<h3>Notes</h3>
Credits:
Tag icon used in the WordPress plugin repository and found in /assets/icon* 
From the series <a href="http://www.toicon.com/series/flat-shadows" rel="nofollow ugc">‘Flat Shadows’</a> By <a href="http://www.toicon.com/authors/1" rel="nofollow ugc">Shannon E Thomas</a>
Thanks Shannon E Thomas and to[icon] for sharing your work!
WordPress repository header image found in /assets: 
<a href="http://www.flickr.com/photos/sdasmarchives/7467520412/" rel="nofollow ugc">‘Crew Baggage Tag’</a>
From the Leslie Grimes Moser Photo set. Moser was a flight attendant for Capitol Airlines. 
Repository: San Diego Air and Space Museum Archive
Thanks San Diego Air and Space Museum Archive & Flickr Commons – flickr.com/commons

Tag Pages

Add tags to Pages, just as you would do with Posts

Anime Dropdown Widget vs Tag Pages