Question: what was the relationship between zabuza and haku?
Answer: In Japan the original version and uncut for the western audience it a sublime romantic relationship like a Japanese husband to wife. Haku is a male ''Yamato Nadeshiko('やまとなでしこ or 大和撫子) (ideal submissive and faithful, lovely spouse) He clearly is loyal and submissive to Zabuza who is the Dragon-in-Chief.