Creates a little quote icon in comment boxes which, when clicked, copies that comment to the comment box wrapped in blockquotes.
Adopt this plugin: I no longer have time to actively maintain this plugin. Feel free to adopt it.
This plugin adds a tiny link that says "Quote" on each comment on your posts. Click it, and the contents of the comment is copied to the comment area, wrapped in blockquote tags.
Note: Doesn't work with Jetpack comments.