I'll let the quotes from manga volume 3 speak for themselves...

-- Chp. 18 ----

Gatou: *reaches towards Zabuza*

Haku: *grabs his arm* Don't defile Lord Zabuza with your touch.

Gatou: How dare you?!

Waraji & Zouri (bodyguards of Gatou): (N-No... he didn't even seem to move...!)

Haku: You don't want to do that...when I'm angry.

Zouri: (He's some kind of monser...)

Gatou: Th-there had better be no more mistakes. If you fail again, don't think you can come back here! *leaves*

Zabuza: Haku...there was no need for you to...

Haku: I know... But it's too soon to finish Gatou off. If we cause a commotion where we are, we might find ourselves on the run from them again. For now, let's be patient.

Zabuza: Ahhh...

-- Ch. 21 -----

Haku: Do you have...anyone special in your life?

Naruto: ?!

Haku: ...When people are protecting something truly special to them, they can become...as strong as they must be!

Naruto: ... Yup! I know all about it!

Haku: *smiles* You WILL get stronger. I know we'll meet again...

Naruto: Right!

Haku: So...you should know... I'm a boy.

Naruto: !!

-- Ch. 25 ---

Haku: Dreams... *flashback*

Zabuza: Pathetic! Look at you... a foundling. An orphan. Thrown away. Unloved and uncared for... Soon, you'll die here, by the side of the road, with nothing to show that you lived or died and no one to care what your dreams were...

Zabuza: !

Haku: ...I...can see myself in your eyes. We have the same expression!

-- Ch. 25 ---

Haku: I find it difficult to embrace the full shinobi philosophy. I can't help but prefer that the pair of you...not force me to kill you.

However, if you two are going to come at me...I shall kill my own heart with my blade-just as the word "shinobi" was originally the words "heart" and "blade"-and act as a full-fledged shinobi would!

This bridge is a nexus of our destinies...and all of our dreams and futures balance on the edge of a knife. I have my own dreams...as you have yours...

Please try not to resent me, but I'm willing to do whatever it takes...to protect the one I care most... to fight, kill, or die to fulfill that person's dreams. Doing so it my own dream.

To that end, I will become a true shinobi...and I shall kill you both.

-- Ch. 26 ---

Zabuza: Heh heh...by all means, defeat me, if you can. You still won't have what it takes to kill Haku!

Since he was a toddler...I've beaten his fighting skills into him! Even in the face of unthinkable adversity, he has always prevailed! He's lost all regard for his own life and become a killing machine... a true shinobi. His skills surpass even my own. And he bears within him the formidable legacy of an inherited kekkei genkai!

Thus, I have forged and carry with me a weapon of matchless quality and skill...

-- Ch. 26 ---

Zabuza: Haku is extremely intelligent. For him, to see a technique is to analyze and understand it. And with that understanding, he can develop effective counter-measures.

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