If they all look the same they don't need new designs each chapter, like with gaijin!
Panthers are the grunts of Panther Claw who are guys with their brain's f'd out or w/e and used as slaves for Panther Zora and Sister Jill.
In some versions they are made of nano machines but usually hen beat they devolve into foam or j=zz or w/e, or just vanish
They are more than a match for most humans but Honey Kisaragi can take em out easy like Sonic rolling through badniks
They are pretty much the Cutie Honey version of the Puddy's in Power Rangers or Iron Masks in Mazinger Z or Goombah's in Mario.