don't know if this counts but Marluxia. The pink guy from KH Chain of Memories.

when i first started watching gravitation, granted i started watching in the middle of the anime, i thought for sure that shuichi was a girl. i mean come on, pink hair and purple eyes??

Haku from Naruto, even after he said he was a guy I still really wasn't sure...

The first time I read Fruits Basket, I though Yuki was a girl. THen I realized he definitely wasn't. But his brother sure is confusing like that!

If I thought anime was realistic I'd think the entire population was boys in disguise as women.

Imagine going to Japan on that assumption. That'd be really awkward when you meet an actual woman.

Truely I cant think of any..... That is sad...... I dont watch enough

1. Momiji Sohma - Fruits Basket
2. Yuki Sohma - Fruits Basket
3. Shuichi Shindou - Gravitation

I know theres more, but i cant think

Do video games count? Because the first amime related/ genderly confusing character I've ever seen is Bridget from The Guilty Gear Games 6_6

Orochimaru and Haku. I honestly thought Haku was a girl at first. xDDD

Lyserg from Shaman King