Bleeders have the ability to emit high-pitched sonic vibrations that cause ruptures in a target's blood vessels. While using this ability, their pupils turn into vertical slits, like a snake's, because of synthetic materials implanted in them to protect their blood vessels from the effects of their own ability. They are also sometimes known as Screechers or Screamers. Pop Girl's brothers and father, the Triads, are Bleeders.
The enhanced sound waves are powerful enough to cause a person to bleed to death from the ruptured blood vessels in their heads.