microkid

This plugin gives you full control over the permalinks for author pages. When using “pretty permalinks”, by default URLs to author pages are structured:
http://www.example.com/author/author-name/
With this plugin you can change the “author” part of these URLs into anything you like, for example:
http://www.example.com/editorial/author-name/ 
http://www.example.com/crew/author-name/ 
http://www.example.com/members/author-name/ 
http://www.example.com/posts-by/author-name/
The plugin will also automatically change links throughout your site that point to author pages. The URLs of author feeds are also changed.
Visit the <a href="http://www.microkid.net/wordpress/author-slug/" title="Wordpress Plugin: Author Slug" rel="nofollow ugc">plugin’s homepage</a> if you have any comments questions.

Custom Author URL

Customize the author slug in the permalink for author pages.

sungraizfaryad

Permalinks, as the name suggests, are permanent links to pages or posts, categories or tags on your website, which makes it easier for your visitors and search engines to navigate around your website.
How many times have you closed a website or not bookmarked it because the URL looked fishy? Plenty of times, isn’t it? There is something about long URLs with weird numbers and characters that make you not want to look at them. Custom Permalinks can change that notion. WordPress can create short, clear, simple, and to-the-point permalinks so that your URLs look professional along with your website.
But there is also a limit in WordPress, and that’s when this plugin comes into play. By using this plugin, you can simplify the permalinks further by removing the base slugs.

Remove Taxonomy Url

This is a purpose-oriented plugin that simply removes the taxonomy slugs from URL.

Custom Author URL vs Remove Taxonomy Url