I'd have to say I'm exactly the opposite. I can't care about a character at all until I watch his or her source material.

Maybe not to that same extent but I've had that for Uiharu even though I doubt I'll ever actually watch her show.

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I have that for a different railgun character.

No, I do, too. I have a decently sized Index/Railgun folder for someone who hasn't seen a single episode.

well, i don´t know if it's weird but i wouldn´t mind and, however, i don't function that way myself.
whenever the pic of a girl catches my eye, i immediately try to find out who they are and, if looking promissing, devote myself to know them. i marathon their series/manga, be it complete or not (ovas and all); i play their VNs until finishing their route (or routes); i lurk for curiosities and more info about them and, JUST THEN, if i'm still interested, i start to search massively for quality pictures of them, to engross my collection.

I do this, but usually with fapping material. I fap to a good deal of charactes I know nothing about. Actually decided to watch a few anime due to curiosity about their character.