tmatsuur

<p>If the emoji of iOS is included in the post content, Do you have any experience that you were not able to save properly?<br />
This plug-in will convert an emoji of iOS before saving, This post content that contains emoji will be saved successfully.</p>
<h4>Some features:</h4>
<ul>
<li>Emoji of iOS convert numeric entity.<br />
target: post_content, post_title, post_excerpt, comment_author, comment_content.</li>
</ul>
<h4>Support</h4>
<ul>
<li>Japanese – http://elearn.jp/wpman/column/emojin.html</li>
</ul>
<h4>Translators</h4>
<h4>Contributors</h4>
<ul>
<li><a href="http://12net.jp/" rel="nofollow ugc">Takenori Matsuura</a></li>
</ul>
<h3>Credits</h3>
<p>This plug-in is not guaranteed though the user of WordPress can freely use this plug-in free of charge regardless of the purpose.<br />
The author must acknowledge the thing that the operation guarantee and the support in this plug-in use are not done at all beforehand.</p>
<h3>Contact</h3>
<p>email to takenori.matsuura[at]gmail.com<br />
twitter @tmatsuur</p>


Emojin

If emoji is included in the post content, this plug-in escaped before saving.

WPDO

<p>Add the slack style emoji to posts, pages or comments.</p>
<h4>Features:</h4>
<ul>
<li>
<p>React with emojis to any post or comment.</p>
</li>
<li>
<p>Post View counter. Compatible with all cache plugins! Easy to use. Automatically exclude bots.</p>
</li>
<li>
<p>Disable comment on any post type (pages, posts, attachments).</p>
</li>
<li>
<p>Most Viewed widget. Recent Reacted Emoji Post widget.</p>
</li>
<li>
<p>Allow guests reaction or logged-in user reaction only.</p>
</li>
<li>
<p>GDPR compliant. With this feature turned on, all logged IPs get obfuscated (md5-hashed).</p>
</li>
</ul>
<h4>Post View</h4>
<ol>
<li>
<p>Edit <code>wp-content/themes/<YOUR THEME>/index.php</code> or <code>archive.php</code>/<code>single.php</code>/<code>post.php</code>/<code>page.php</code>.</p>
</li>
<li>
<p>In the loop <code>while ( have_posts() ) {</code> or anywhere you want to show the views, add the following codes: <code>do_action( 'remoji_postview' );</code>.</p>
</li>
</ol>
<p><em>API</em></p>
<p>To show postview in themes/plugins, use <code>do_action( 'remoji_postview', $the_post_id_to_inquire );</code>.</p>
<p><em>Shortcode [views] available</em></p>
<p>Use <code>[views]</code> or <code>[views id="3"]</code>(To show the views of post ID 3) in your editor.</p>


Remoji – Post/Comment Reaction and Enhancement

I like this because it allows one to react in many different ways in posts and comments. And it looks nice and doesn't take up a lot of space. One issue though is if you turn on IP privacy, someone is able to react repeatedly. If improvements are considered, then I suggest the following:

1) Add an option to track by logged in user, and also that would mean only people logged in can use it.
2) That would solve the reacting over and over again but for those would want to allow visitors to react then there would have to be another way to prevent excessive reacting. Or, at least a warning that if you turn on IP obfuscation then people will be able to react over and over. 
3) I hope you can one day add the ability to delete reactions.
4) A widget showing most reacted posts would be cool too.

Very nice

Reactive emoji. Allow visitors to add emoji reactions to your posts and comments. Disable comment for pages, posts.

Emojin vs Remoji – Post/Comment Reaction and Enhancement