Did you model this as a single part, or is this an assembly?
If it is an assembly did you model it like a real LEGO, so it can be articulated?
Something else you might want to consider, is that while support is useful, if you get clever about your model, you may not need to use any. Cutting your model in strategic places and printing it in pieces may be the solution, as long as you're using ABS. PLA is not all that easy to glue (crazy glue/CA works, but it doesn't hold forever)
Your helmet for example, I would probably try to split it down the middle, and print the front and back . You would use support, but only to support the inside. If you decide to print it with the head inside, you wouldn't even need that.

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To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.