My own 'controversial' opinion basically comes down to 'there are no anime characters a normal 16-year-old boy can relate to'. And by 'normal' I mean 'normal' according to real life, not 'gets a whole bunch of random girls, usually with special abilities they hide from everyone else'. Not to mention it's impossible to relate to any of those girls, no matter who you are: sure, maybe some of them actually do have faults, but they're lucky more than anything else. How did they gain their powers? Being in the right place at the right time. Getting stronger? Luck. Being like that in the first place? Their luck started while they were still just an X-chromosomal sperm. What makes it even worse for me is that while some girls can pretend their sperm was as magical as that of Usagi Tsukino, I have no such avenue. And that just turns me right off everything, even stuff I'm still slightly interested in: Black Rock Shooter, Fate/stay night, Nanoha, Madoka Magica, and yes, Sailor Moon. And you know what else? Usagi is probably the worst of the whole lot!
*inhale*
Feel free to rip my opinion apart, as usual, just quote the parts you object to so I know you're doing it.
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Edit: For comparison, here's the only anime (or anime-ish) character I've ever even slightly related to: Neku Sakuraba. Yeah, he's just as lucky as Usagi up there, but he has actual character flaws that a normal person (like me) might have. Also, I control him. That's also why I don't put Reimu up with the others: I can stand video game characters better because if I stop caring about the characters, I can't continue the game.