Hm... you know, it's really hard to think about.
Haruhi Suzumiya would be one because we both have narrow interests, are aromantic (mostly for me), don't do well with people and get excited about various things. I also notice that I'm a lot like Ponyo. I know she's a fish out of water or whatever... but I really relate to her a lot as well. She gets obsessed with certain objects, she doesn't like loud noises, and I could just go on forever. Let's see... Chihiro is also another character too. I relate to her because I'm a very anxious person, and a lot of things tend to upset me at times.
I can't think of any other relations I have...