DimitriAus

This lightweight plugin removes WordPress emoji functionality to reduce HTTP requests and improve page load times.
What it removes:
<ul>
<li>Emoji detection script from page head</li>
<li>Emoji styles from frontend and admin</li>
<li>TinyMCE wpemoji plugin</li>
<li>Emoji conversion in RSS feeds</li>
<li>Emoji handling in emails</li>
<li>DNS prefetch for emoji CDN</li>
</ul>

Manly No Emojis

Disables the emoji functionality in WordPress to improve performance.

Sharon

Implement emojis into your posts and pages. Using CSS, transparent PNGs seamlessly integrate with your favorite theme and color scheme.
This plugin shows emojis by using shortcodes. It will not override the default <a href="https://codex.wordpress.org/Using_Smilies" title="WordPress Smileys" rel="nofollow ugc">Smileys</a>.
How To Use:
<ol>
<li>After activating this plugin, an emoji icon will appear next to your “Add Media” button above the editor window.</li>
<li>Click on that button to display the dropdown list of available emojis.</li>
<li>Click “Add Shortcode”, and the shortcode will automatically be added to your editor window.</li>
</ol>
Alternatively, you can type in your shortcode by hand using this format:
<pre><code>[sce emoji="happy" /]
</code></pre>

Sharon's Shortcode Emojis

Implement emojis into your posts and pages

Manly No Emojis vs Sharon's Shortcode Emojis