Neji had his entire role in Part II/ (Shippuden) annihilated.
He was such a badass, with badass fight in Sasuke-chase arc; and had so much development previously... Then he was just reduced to ash, just so Naruto and Hinata can have a touchy moment with his death.
he would've made more impact if he actually died in the fight against that spider guy. (his name escapes me)
Yamato...
This dude was like... completely forgotten until the very very end. It just felt like he included him in the end, for the sake of tying-up the ends so no fan pesters Kishi with questions.
1010/Kiba
Speaks for itself.
Kaguya
She didn't even change anything. Her plan was identical, except it was mixed with a tad bit of PURE EVIL :Omg:. Instead of Madara cocooning people for the sake of idea to stop conflicts on the planet, Kaguya instead wanted people to then become white zetsu, for......................reasons.