Does he see TIM as villain or savior
Well, Shepard is savior, so there's not much of an option.
hero or victim
I'd say neither.
Pro-human or anti-alien?
I suspect he doesn't hate nonhumans personally, he just is happy to employ people who do, and use their hatred for his own ends. Yet another similarity he shares with Palpatine.
Interactive character or final boss and cannon fodder?
Not the last one.
Human or Fate's pawn?
Well, no one who's ever tried to use Reaper technology aside from its most simplistic/minimal applications has ever ended well.
Someone we can talk to or something we must shoot at?
See Saren. They're hardly mutually exclusive, despite ME2's attempts to make people think otherwise.
Will he remember if Shepard kept the base, or will he get a convenient amnesia, like all those Shepards who easily forgot that if not for TIM, they'd be Collector goo?
I never forgot. But I can't have a good deed done for me personally prevent me from stopping a threat.