- last post: 01.01.0001 12:00 AM PDT
The suite most likely has an integral unit for dealing with both bodily waste and persperation.
For anyone who has seen the movie dune you may remember the suites they wear have special systems for gathering sweat and (I think urine also) and purifying it into a drinkable water due to the dessert conditions of the movie.
While the MC does not have such purification systems the very real hampering effects of urine and sweat gathering in an air tight suite would lead to the need for waste removal.
Chances are the inner layer of the suite has some weak vacuum of sorts to collect any persperation and expel it, while for urine a simple tube with a condom like attachment may be sufficient to gather urine during extended battles (otherwise there are means for him to take off his armor), while as for feces a similar collection system may collect the waste and expel it quickly outside the suite through tubes and such that lead to openable hatches.
Really it is not all that difficult to imagine. With a vacuum capable suite meant for battle they most likely installed such systems into the suite as anything else would hamper his ability to fight in situations where he can not fight without his suite (space, poisonous atmosphere, etc).
Otherwise taking in a wasteload inside the suite would hamper both his mobility (which is needed) and possibly cause a health risk due to the unhealthy nature of the waste.
Also it may be entirely possible that the MC's modifications to his body include certain bladder control and such which can give him many hours more of bladder control than even the most capable human. Though chances are the suite it's self just has means of dealing with waste.