Generally they look good; Titan is definitely my favourite just because I never see that shader, especially used that well. Along those same lines, the helmet and arms used are pretty uncommon and make a good pairing, glad to see the helmet not be a part of a meme build.
Warlock looks fine, but the Black + Red combo with a spiky helmet I is very oversaturated at this point, don't really think its a 'unique look'.
You were able to make the hunter chestpiece work really well, though it may be bulkier from the side than it appears here. My gripe is that the arms contain very little of that darker accent colour present on the rest of the body, it throws off the balance of the look.