Superhuman Physiology: Kumagawa's most frightening trait is his tenacity; no matter how many times he is beaten down, he always gets back up due largely to his history of losing at everything, meaning he can easily shrug off any kind of beating. It was apparently this aspect of his person that caught Ajimu's attention in the first place. Even without All Fiction, Kumagawa is capable of bouncing back from injuries that would cripple other humans for months.