He was really cool. Lol funny how naruto was blushing because of how "Beautiful" Haku was xd lol Naruto is gay He kissed Sasuke and he thought Haku was hot lol
JK btw the joke I just made is in fact a joke so dont get your underwear in a twist.
Haku would've been incredibly powerful had he lived, the one handed jutsu, OP KG, and ability to react so quickly was incredible. We lost a few geniuses early on, sucks but it happens.
He was probably a chuunin-level. Even genin Neji or Gaara probably would've defeated him at the time. Although he probably would've grown up to be a very powerful jounin.