OzTheGreat

For WordPress Multisite (WPMU) installs, allows Super Admins to easily manage each users roles and blogs from one 
screen in the Network Admin menu.
You no longer have to go to each blog to change the user’s role. It’s also 
much easier to see which sites a user is associated with.

Multisite User Role Manager

Ajax management makes it super easy to add users to a bunch of sites in the network. Does 1 things really well, more plugins should work like this.

Great for multisite user management

Made adding a user to 20 sites a lot easier than using WP's default interface for that (way less clicking around).

Much easier to assign a user to many sites

I spent about 30 minutes looking at different multisite user management plugins and all of them were either out of date, or tried to do too much. This plugin solved the exact issue I was dealing with: adding a user (with a specified role) to all of my client's subsites. 

Thank you very much. 

I wish you all the best,
Kevin.

P.S. the CSS for the admin screen where you add users to subsites was a bit off for me (in Chrome). The table did not fit the modal background (it hung off to the right a bit, and forced me to scroll even though there was plenty of vertical space). It doesn't bother me but it might bother some other users so I figured I would let you know. 

Excellent plugin - it does what it says!

Manage user roles for each blog from a single screen on multisite (WPMU) setups

Hossni Mubarak

HM Plugin

This <a href="https://hmplugin.com" rel="nofollow ugc">HM Multiple Roles</a> plugin provides a user interface and allows you to select multiple roles for a user.
It hides the default role dropdown list and displays a list of role checkboxes for both new user and update user page.
Multiple roles can be visible from the All User list page.
 How to use it: 
<iframe loading="lazy" title="How to use HM Multiple Roles in WordPress - 2021" width="750" height="422" src="https://www.youtube.com/embed/Kw4R8B1cV5s?feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
🌟 Plugin Features:
<ul>
<li>Easy to install and use</li>
<li>Fully integrated in wordpress</li>
<li>Select multiple roles</li>
<li>No extra settings required</li>
</ul>
👍 Feedback/Rating: 
If you find this plugin helpful, feel free to give us your valuable review. Rate us and share this plugin with your friends and others. This will motivate us and help us to grow. 
<a href="https://wordpress.org/support/plugin/hm-multiple-roles/reviews/#new-post" rel="ugc">Rate Us</a>
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HM Multiple Roles

It hides the default role dropdown list and displays a list of role checkboxes to select multiple roles for a user.

Multisite User Role Manager vs HM Multiple Roles