This is what we found on Wikipedia regarding the Guts:

Guts (Japanese: ガッツ, Hepburn: Gattsu, sometimes romanized as Güts) is a fictional character and the protagonist from the manga Berserk, created by Kentaro Miura. Guts is a mercenary who travels from company to company and companionship to companionship. After meeting Griffith, Guts is defeated in battle by Griffith and is forced to join the Band of the Hawk as the latter proclaims he now "owns" him. The dynamic and turbulent relationship between Guts and Griffith, the leader of the Band of the Hawk, forms the primary focus of the manga. After the events of the Eclipse, during which he loses his left forearm and right eye, Guts seeks revenge on Griffith.

The character has also appeared in the animated adaptations of Berserk as well as video games with multiple voice actors. Miura conceptualized Guts' character while he was an assistant to George Morikawa. He mentioned multiple influences including Fist of the North Star, Dororo, Mad Max, and Conan the Barbarian, among others.

Critical response to Guts has been highly positive. Guts has been praised for the themes he embodies as a result of his tragic backstory and how he becomes an anti-hero in the process, to the point of being of one of the most iconic characters in manga and anime.