I'm looking for any series where a character is sexually aroused or attracted to:
NUMBERS & LETTERS.

Anything that isn't living or isn't in humanoid form would also be great, like shapes or whatever. Or if a character was only attracted to people with two heads, 11 fingers, 10 nipples, 5 eyeballs, etc.

You get the point. Attracted to something TOTALLY different. Any genre would do.

Er. Well, Yomiko Readman from Read or Die calls herself a bibliophiliac. Though I'm not sure how sexual her obsession is.

Mathematical Girls i guess?

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Carnivorous Princess Yegrinna maybe (I only read the first chapter though)

They're long shot but:
Haganai there is a girl who is only sexually aroused by mecha, and she reads doujins where mecha have sex.
Sankarea he's only attracted to zombie chicks.
Ai Kora he's attracted to boobs with the shape of a shinkansen. They're still boobs anyway.
There is also Death the Kid in Soul Eater who is obsessed with symmetry, but it's not exactly a sexual attraction.

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What I like in Trivial Pursuit style. Pick your category:

Thanks for the suggestions! I have never read Mathematical Girls. I'll look into it.

Also, any series where a character is sexually attracted to certain types of FOOD, ITEMS, or TOOLS would be great to introduce as well..

I didn't explain earlier, but in that manga the protagonist loves math in a very umm... twisted way.

Yeah. I'm already familiar with it. I read the series already.
But thanks to your guidance, I was able to find a list from the category tags called: Anthropomorphism.

Thanks. If there are still any suggestions remaining please do recommend.