Protagonist of the Cosmaton series. The Cosmaton games are traditionally story-focused horror-action shooter faire, known for frankly unfair difficulty and the ability to face bosses in any order*
*Note: Does not guarantee you can beat them in any order.

“The Marine”, always implied to have been a robot. Not the titular Cosmaton, those are little jelly guys. Game about 2010ish had a shot of an eye through the helmet, implying them not to be a robot. There has been discourse ever since.
There has not been a game since.

Can’t crawl. Can scuttle. Becomes a morph-isopod when crouched.