Hermit also known as Natsu Tanimoto was one of the Eight Fists of Ragnarok; eight of the strongest members of that organization. Most of the Fists have adopted the names of legendary beings and figures from Norse mythology.
Natsu Tanimoto is a skilled, confident and powerful martial artist.
In the English dub version of Kenichi: The Mightiest Disciple Hermit was originally voiced by Jason Liebrecht for season 1. For season 2 Hermit was voiced by Eric Vale.
Jason Liebrecht was unfortunately not able to record his lines for season 2 because of a motorcycle accident which put him out of commission for an entire year. Eric Vale was then brought in as his replacement.