I think Nyan might be able to kill Saitama and Dark Shine, if he could manage to get inside them and use feline retribution on their internal organs and brain. Cause their organs are not invincible
Maybe Darkshine's aren't but Saitama are probably as though as himself.
Besides he'll probably just sneeze him out or something.
But for now, Nyan is inactive and its corpse is obtained by Zero/Drive Knight
So no need to worry
Nyan cannot even get in, and he wouldn't get through someone's ears, or nostrils or anything
Nyan saw Saitama killing a dragon threat in one punch and he runed away from him so if he fought him Saitama may win
He actually tried to hurt Saitama, he couldn't anything other than a scratch
It was a comical scratch tough.
What do you think?