While I do like Haruka and Michiru quite a bit
for their own sake and not even just because of their relationship, and while they're in my top 20 for characters in the show (I like a lot of characters)... it so happens that I think (
in the anime) between their callous approach to Pure Heart victims and the various events during Sailor Stars, they are basically villains. Sympathetic vallains, but they cross the line too much, too often, and too seemingly of their own initiative to be considered heroic. Especially when
They turn on Saturn and Pluto. I don't care if they thought it was the only hope for defeating Galaxia, they were wrong about that, and even if it had worked, it's a horrific thing to do. Also by this point they should've known better. AND this doesn't excuse the time they shot at Sailor Star Fighter unprovoked when he went to shake hands with Sailor Moon, completely overriding her judgement as their princess, which they knew by this point about making alliances and trusting friends. And guess who did play a more vital role in actually helping Sailor Moon stop Galaxia in the end?
I don't mean they're bad or terrible or even truly evil. I mean they're in the dark gray and making exceedingly questionable decisions, like the Shitennou (who are also high among my favorite characters) who were brainwashed into their evil actions and only occasionally fumbling into more noble deeds (particularly Nephrite), or the Ayakashi Sisters. Basically, with Haruka and Michiru, it's sorta like they're
halfway corrupted or something
Hotaru is initally forced into villainy, but she was under a lot more duress about it, and she recovers a lot more fully and is always kind afterwards, so I consider her
more heroic than the two of them in spite of the whole mistress 9 thing.
Pluto seems okay on the ethics front, but it's so hard to judge her actions because we understand so little about what she knows and what her agenda really is, she's sort of mysterious (and in Sailor Stars she seems to be completely bamboozled by everything that's going on). I'm particularly concerned about how vague the circumstances of her taking baby Hotaru away to live with Haruka and Michiru was, and what involvement/agreement Souchi Tomoe had in any of that, since the show never clarifies it at all beyond their initial meeting in Sailor Stars.
Which segues into another weird opinion of mine, which is that I like to take the
apparent "timeline" of the anime literally and at face value- including the way it doesn't make sense. I believe the flow of time has been severely disrupted in the setting, which is how Usagi turns 14 in 1992 (per the tickets on Operation Romantic Cruise) and 16 in 1996 (per the Live Tour sign on the Starlights' first concert in the area that we see), and why they're studying furiously for exams in S and then forget about it for a year in SuperS and suddenly pass the exams by the start of Stars. I think spacetime has been going more and more off the rails ever since whatever Usagi did with the Silver Crystal in episode 46. There is at least some
presence for that being canonical that they had to repeat a year somehow, so time has been mangled at least a little bit. So I think that's
why Pluto was so baffled by the end.