Alien marine close combat specialist 2

Wanted some sort of gaseous or energetic life-form in full armor. Or just a human or humanoid who doesn't breathe the same elements than most of the federation species.

 Shown gutting a bigger adversary.

Mariner girl

Beret girl

Tried something a bit more near-future than space opera.

Yyrrgyl

Nicknamed the medushark.
21 mm top of "fin".

Alien

18 mm top of "horns/bits" posed as it is.

Alien mutant

16,25 mm top of head posed as it is.