Clingers

In first person games these usually cover the display, implying they're attached to the player's head/face.

These may cause quick time events, require special maneuvres (e.g. shaking movement/view control around as if trying to shake the clingy critter off) or implicit usage of melee attacks, or something else to get them off.

A trivial example for this is a leech that sticks to the player and causes a constant health loss until removed.

See also: grapplers (when they specifically incapacitate the player [almost] completely)

Related:
* Aliens
* Parasites
* Insectoids