Now we all know Haku from Naruto has alot of controversy about wether it's a female of male. I personally think Haku is a female, because when Naruto first met Haku. She was wearing this band around her neck that only japanese women wear. Another to support my answer is that Zabuza could have easily say Haku's a boy so that he wouldn't feel ashamed. Plus everytime I see Haku in the anime she has cleavage (boobs).
So if anyone has any information on this, please tell!