Karin Sasaki

is a member of Special Fire Force Company 4.

VS. Special Fire Force Company 4 arc
Karin appears in this arc. He picks on Shinra when Shinra showed up in Company 4. Shinra insults him causing Karin to grab him; however, Shinra knocks him down easily which surprises Karin.

Ōbi's Rescue arc
Upon tv broadcasting that Akitaru Ōbi was arrested for attempting to kidnap Shinra Kusakabe, Karin told Ogun Montgomery that it was hard to believe that Special Fire Force Company 8 would be involved in the incident.

Post-Arthur's Adventure arc
Karin appears in this arc.