Preatorian - the guardian.
I always liked the Praetorians for their big crests. Sadly, these are very rare and almost never displayed in movies, games or adaptations.
A custom I did at the end of last year.
I took NECA's Xenomorph Drone (Big Chap) and had a lot of sculpting and customizing - starting with the crest-head and ending with doing custom heels, spikes on the legs, arms and the tubes on the back. Also, repainted the figure.

For more photos visit my Blogger - uglyducklingcustoms dot blogspot dot com
(I also have a YouTube channel - /user/UglyDucklingCustoms)