axenso

You can enable a tooltip that shows info about user/author when you rollover/click on related avatar.
Let’s speak clearly: if you are loooking for a plugin that enables the standard Gravatar hovercards, this is not the plugin right for you. Please look for another one.
When you rollover/click on an avatar (e.g. of a comment author), a tooltip popups and shows:
<ul>
<li>some additional links if the author is a registered user: e.g. to user post archive, to user external website, to user blog (if multisite)</li>
<li>some info from Gravatar if author is registered to that service: e.g. location, “about me” description, websites, other account pages (facebook, twitter….)</li>
</ul>
In plugin settings you can set up the javascript and css main options.
The plugin comes with some filter hooks, so you can customise the tooltip content at all.
The plugin uses <a href="http://craigsworks.com/projects/qtip2/" rel="nofollow ugc">qTip plugin for jQuery</a>.

Avatar Tooltip

To show a tooltip with info (member info and Gravatar profile) when you mouseover/click on an avatar.

Homer WP

🧰 Block Editor formatting tools to give you more control over your content.
<h3>Formatting Features</h3>
<ol>
<li>
Text change animation 🔁
</li>
<li>
Inline icons library (with gradient)
</li>
<li>
Emoji library 😉
</li>
<li>
Tooltip popover
</li>
<li>
Special characters library ❁
</li>
<li>
Screen reader content
</li>
<li>
Language attribute 🌍
</li>
<li>
Hidden text / Spoiler
</li>
<li>
Uppercase text
</li>
<li>
Lowercase text
</li>
<li>
Capitalize text
</li>
<li>
Underline text
</li>
</ol>
<h3>How to use</h3>
<ol>
<li>
Go to post or page where Gutenberg editor is enabled.
</li>
<li>
Select the word you want to format.
</li>
<li>
Open more formats via clicking the “Homer Formats” button.
</li>
<li>
Choose the effect you want to apply.
</li>
</ol>
⚙️ Universal: With this plugin you can add these effects to the text of almost any Gutenberg block, which is not limiting it format options.
⚙️ Animations: You can choose one of the types of animation that best suits your design, and change the settings to achieve the desired effect.
⚙️ Completely Customizable: You can customize the content, speed, etc to make it suitable for your website design

Homer – Block Editor Tools

Does what it says, and it does it perfectly !

Well done, and thanks. 

Really good.

🧰 Block Editor formatting tools to give you more control over your content.

Avatar Tooltip vs Homer – Block Editor Tools