Executor

NG2: Executor artwork

The Executor is an enemy in Ninja Gaiden II and its remakes.

Description

The Executor enemy appears to be a cyborg of sorts, with a human head connected to a machine. It's body has 4 spider legs and the head is seated in a large cockpit. The head itself is lifeless with glowing red eyes and a pure white colour tone. The executors right hand is a machine gun with multiple barrels. They are first encountered in the story chapters of NG2 during "The Flying Fortress Daedalus" chapter, not counting any Tests of Valor.  The only attack of the Executor enemy is gunfire from its dual mounted machine-gun "arms". 

Sentry

Sentries are first encountered in the story chapters of NG2 during "The Heart of Darkness" chapter (not counting any Tests of Valor) after all ninja are killed in the camp with two spotlights.  In Ninja Gaiden Sigma 2, Sentries can only be found in Team Mission mode, specifically the third wave of Master Ninja 2.

The Sentry enemy appears to be a variation of the Executor enemy.  Although the Executor enemies crawl on the ground with four mechanical legs, Sentries have no legs and appear to quickly hover over the ground with some sort of flying mechanism.  The only attack of the Sentry enemy is firing missiles from its dual mounted missile launcher arms. 

Gallery

NG2: Executor artwork

NG2: Executor promotional screenshot

NG2: concept artwork of the Sentry (variation of Executor enemy)

NG2: Sentry screenshot