Night Fright

Night Fright, originally called Night Sight and The Phantom Assassin, was a Zanzibar Land mercenary specializing in guerrilla warfare and a minor antagonist in Metal Gear 2: Solid Snake.

Backstory
Night Fright was the last surviving operative of the legendary guerrilla squad The Whispers. Armed with his silenced sub-machine gun, Night Fright was infamous for his renowned assassination skills and stealth camouflage, rendering him almost always invisible and unseen by his enemies.

Metal Gear 2: Solid Snake
Night Fright, in 1999, was eventually hired by Zanzibar Land to assassinate the veteran FOXHOUND agent Solid Snake. In the detention camp's basement, Night Fright had the upper hand thanks to his invisibility, but Snake used his heightened sense of hearing to find and kill his stealthy opponent.