Grégory Viguier

With this plugin, administrators can change the default author base in the registered users profile url, and the author slug of each user. 
Changing an author slug is a good thing for security (if your login is “This Is Me”, your slug will be “this-is-me”, a bit easy to guess). 
The plugin adds 2 fields for this purpose, one in permalinks settings, the other in a user profile.
<ul>
<li>Default: example.com/author_base/author_nicename/</li>
<li>Customized: example.com/jedi/obiwan/</li>
</ul>
<h4>How to edit the slugs</h4>
<ul>
<li>Go to Settings > Permalinks to edit the author base: “author” => “jedi”</li>
<li>Go to Users > “Any user profile” to edit the user slug: “agent-smith” => “obiwan”</li>
</ul>
<h4>Translations</h4>
<ul>
<li>English</li>
<li>French</li>
<li>German by <a href="https://wordpress.org/support/profile/carny88" rel="ugc">Carny88</a></li>
<li>Spanish by <a href="https://wordpress.org/support/profile/oliverbar" rel="ugc">Oliver</a></li>
</ul>
<h4>Multisite</h4>
<ul>
<li>The plugin is ready for Multisite.</li>
</ul>

SF Author Url Control

Allows administrators or capable users to change the users profile url.

sungraizfaryad

Remove Taxonomy URL strips the base slug (<code>/genre/</code>, <code>/topic/</code>, etc.) from your custom taxonomy term URLs so visitors and search engines see clean, short permalinks.
What 3.0 adds:
<ul>
<li>301 redirect old URLs — old <code>/taxonomy/term/</code> URLs redirect permanently to the new <code>/term/</code> URL so SEO equity is preserved when you turn the plugin on.</li>
<li>Hierarchical term URLs — nested taxonomies resolve correctly. <code>/parent/child/</code> reaches the child term instead of returning 404.</li>
<li>Pagination support — <code>/term/page/2/</code> works after the base slug is removed, no more pagination 404s.</li>
<li>Slug-collision detection — warns you (without blocking the save) when a term slug clashes with a page, post, or another taxonomy’s term, so you don’t accidentally break a URL.</li>
<li>Health Check tab — run a full audit of all selected taxonomies on demand.</li>
</ul>
All 3.0 features default to OFF on upgrade so your existing site behavior is preserved until you opt in.

Remove Taxonomy URL

Strip custom taxonomy slugs from URLs. Optional 301 redirects, hierarchical terms, pagination support, and slug-collision detection.

SF Author Url Control vs Remove Taxonomy URL