Will Brubaker

You’ve poured your heart and soul in to writing fascinating blog posts.  You know you have a lot of readership, but nobody except your mom is leaving comments.  That’s a bit discouraging right?  Entice your readers to leave comments by giving them a picture of a cute kitten in return.
Just prior to the comment form coming in to view, an unobtrusive panel will be displayed with a short message that says: “Your comments make us happy.  Leave a comment, get a kitten!”
 
When a comment is submitted, a picture of an adorable kitten is displayed in a modal window.
Caveats:
This plugin assumes that your comment form is A) built with the ‘comment_form’ WordPress function and B) that your comment form has an id of “commentform” (This is the WordPress default, but your theme developer may have changed the behavior for whatever reason. 
This plugin assumes that comment forms only appear on single posts and only loads the code when a single post (or page) is loaded. 
 
<h3>Other Information</h3>
I created this plugin for my own amusement and am offering it for you to use as you wish.  If you find it useful but would like more features, please do ask.

Kittens for Comments

Works well, customizable and just damn cute! Love it. =D



Awesome

Encourages your readers to leave comments with the promise of a kitten picture.  Who doesn't love kittens?

Atawai

This plugin addon for Elementor Website Builder it mean you need install <a href="https://wordpress.org/plugins/elementor/" rel="ugc">Elementor</a> plugin and activate before.
<h3>Widgets</h3>
The plugin offers inbuilt widgets that help to create design more attractive.
<ul>
<li>Slideshow – Slideshow based <a href="https://github.com/nicinabox/superslides" rel="nofollow ugc">Superslides</a> engine with part: heading, subheading, text and two action buttons.</li>
<li>Gum Heading – Three colors heading with line and image decoration.</li>
<li>Pricing Table – Pricing table with two pricing systems.</li>
<li>Recent Post – Show recent post list.</li>
<li>Blog Grid – Show blog post ( including pagination ).</li>
<li>Blog Term – Show blog term list ( tag, categories ).</li>
<li>Post Meta – Show sortable post meta for single post.</li>
<li>Post Term – Show sortable post term and divider for single post.</li>
<li>Post Related – Show related post for single post.</li>
<li>Post Adjacent – Show previous/next post for single post.</li>
<li>Post Share – Share post to social media.</li>
<li>Post Image – Show featured image for single post.</li>
<li>Post Slider – Show recent post with carousel.</li>
<li>Popover Button – Hotspot button icon.</li>
<li>Site Menu – Show main menu as site navigation.</li>
<li>Special Option – Inner section width like Top section, Inner section position like common widget.</li>
<li>To Top Button – Show to Top Button.</li>
<li>Image Box – Show image box with button and text.</li>
<li>Image Box Carousel – Show image and button with carousel.</li>
</ul>
<h3>KEY FEATURES</h3>
<ul>
<li>Slideshow</li>
<li>Background Masking Image</li>
<li>Inner Positioning</li>
<li>Two Styles Heading</li>
<li>Post Meta</li>
</ul>

Gum Addon for Elementor

Offers inbuilt widgets for elementor that help to create design more attractive

Kittens for Comments vs Gum Addon for Elementor