Sparanoid

<p>Displays a user badge next to the comment author name based on author’s role.</p>
<ul>
<li>No database writes, no configurations, install, activate and go.</li>
<li>Easy styles customization via Jetpack Custom CSS or built-in Custom CSS (WordPress version 4.7 or higher required).</li>
<li>Works with <a href="https://wordpress.org/plugins/current-theme-body-class/" rel="ugc">Current Theme Body Class</a> plugin.</li>
</ul>


Comment Author Role Badge

Displays a user badge next to the comment author name based on author's role.

Engramium

<p>Displaying user role label gives weight to comments made by registered users on your website specifically authors, editors, and admins. In this article, by using this plugin you will be able to easily add user role label next to comments in WordPress.</p>


Starlit

Add User Role Label Next to Comments in WordPress

Comment Author Role Badge vs Starlit