I dunno if I can say anything that Hoopy hasn't, or that you probably don't already know
But I will say that the moment I knew I was in love with my wife was when I happened upon an issue of Wizard magazine in her dorm room. Then I saw the rest of her comic collection and the art she'd done and spent the next few years coming up with the proper timing for the wedding proposal.
In any case, I think the mutual interests are what brought us together. It seems to me like you and your woman already passed that step and are on to being enamored with the things about each other that go beyond reading and food preferences. Stuff like your character traits and the parts of yourselves that you are proud (sometimes not so proud) to share with one another.
I think as long as you have something to love, pastimes are kind of just that, a way to pass the time. Granted, you said you actively disapprove of certain things in one another, and depending on the severity that can be an issue (aka one of you smokes weed and hates that the other doesn't, can cause HUGE issues down the road, I've seen that one). But if you just make fun of her because she likes Sailor Moon, I think worse things could happen.
Note: my wife does love sailor moon. And I never stop making fun of her for it.