NS Widget Recent Comments is simple and effective plugin. There is only two, but most important options that you can choose:
Clean design makes it easy to fit in any kind of look of WordPress themes.
Tested up to: 4.4.2
.r1394419
Stable tag: trunk
License: GNU General Public License
License URI: http://www.gnu.org/licenses/
This is a widget that let you show the latest comments from your WordPress Blog in a Sidebar area with comments author’s avatars.