Miru Toraeru

Miru Toraeru (ミル・トラエル) is yellow eye program from Cyber Peacock's stage in Mega Man X4. They are believed to be rogue anti-virus vaccines that are under Cyber Peacock's control, but still do as they are meant to (purge foreign bodies of data found in the system), except targeting the player instead of Mavericks that are teleported into cyberspace.

It will capture the player when they come into contact, cause 6 points of damage after a breif moment, then release the player before disappearing. Majority of Miru Toraeru in the stage spawn "rolling" across the screen while the rest spawn stationary. They are impervious to regular attacks if they are spawned moving, but can be attacked if stationary.

The best ways to prevent being trapped by Miru Toraeru are to use Soul Body or Kuuenzan, both of which will "delete" the incoming programs. If you are playing as Zero and have difficulty using Kuuenzan, Raijingeki will repel the Miru Toraeru, which is good enough to avoid being ensnared by them, even though it won't destroy them.

Trivia
Miru means look, watch, view, see, and Toraeru means capture, arrest, grasp. Therefore, its name can be translated as "Watcher Capturer".