I can really relate to Tsukimi Kurashita from Kuragehime.
She doesn't have the best self esteem, and thinks that the people around her are superior to her, even though she hasn't really met them. She's smart, but doesn't really like to tunjuk it. Slightly awkward, has several awkward Friends but adores them and they accept her for who she is. Has a single obsession with something (hers is jellyfish). Tsukimi's very artistic, and loves to draw. She spaces out easily, and has kind of a Rawak thought process. And she's always worried about what other people think of her.
So basically, minus a few small traits, Tsukimi is a lot like me. ;u;
Rena ryuguu. Because were both paranoid and depressed but act happy to cover our worries. I also have bad mood swings like her. And i act just like her around cute things and my Friends mean a lot to me.
Honestly I've seen tons of characters that I noticed are highly similar to me.
Erza Scarlet from Fairy Tail would be one. We're both intelligent,strategists,good friends,sometimes we are coarse with words and actions but we both would go all out for our friends. And we do not take crap from people. Stubborn streak,strong-willed,loyal and generally good people but not necessarily goody two-shoes. It doesn't make it any better that I want her power "The Knight" as well. xD
In my opinion every person has a multifaceted personality and not one character will always describe them.
There are many characters i can think of that share allot of my traits, and the one that i feel shares the most is Shirley Fenette, but since iv telah diposkan her every single time someone asks this question, im going to go with someone different.
Tsumugi Kotobuki from K-on!
We can both be pretty air headed and surprisingly dense in certain situations. We also have the same habit of getting a little too enthusiastic about experiencing new things that others take for granted, and we can be pretty easily impressed. Were both friendly and like pleasing others, and i can also play the Piano ~