>>14155516
Powerups that you loose when you get hit or when you die or get a soft game over as well as powerups that you loose when you pick up a different powerup. The point is that they don't become intrinsic to your character once acquired like in Zelda or Mega Man for example.
>>14155557
That's why I included semi temporary. I wasn't exactly talking about stock items although those might fit too in certain situations.