Tohru-kun of Furuba. She so sweet, but she's a... well, a "dumb brunette", I guess XD
Plus, she has Kyo and Yuki totally wrapped around her finger and she's oblivious to it until book 10-ish. Maybe even later.
Obviously Momiji Sohma from Fruits Basket! He is so cute and super sweet ^^ Seriously whenever I talk about his cuteness I feel like I'm going to explode xD