They arnrt exactly a hostile creature as they simply fly back and forward indefinitely with no sole purpose other than that.
Apparently they lack a brain which may give reason for their simple behaviour.
There exist two varinets of Rippers, the ripper two which is red and propelled by a flame, and the Grapple beam ripper, which can be hooked onto with the Grapple beam.
Rippers make their first appearance in the series in the original game. They are commonly found in the tall shafts and can be frozen with Ice beam for extra elevation.