Head vs Heart
I like Haku hes awesome but I wasn't upset when he died,I was upset when Konan died because she was one of my favs.I really didn't care to much for Itachi or the rest you listed but Shikamaru and Neji.When Neji died I was kind of shocked but I knew somebody was going to die..weather the main or side characters(like why not TenTen she the least seen character).Tbh I like Kakashi too but he is kind of useless now he was kind of before then too a little he always ended up in the hospital or somebody has to save him he even died once.
Oh i wasn't sad when Haku died, he is my favorite but wasn't sad because if not for him being too nice There wouldn't be a naruto show because haku would of killed all four, Naruto, sasuke, kakashi and sakura. as zabubza said That even haku was more stronger and powerful then him himself and they had trouble with him. Not to mention that zabubza could of killed naruto if haku didn't block the attack lol Just pointin gout yet another one of my favorites gets killed off
Konan was my favorite female and again dead. again though wasn't sad Because knew she had no chance in going up against "MADARA" LOL Aka really obito and at least she was one of the first to really damge and out smart him before dying.