lols , they both never talk .
You're ignorant.
They're quiet, but both speak up when needed.
They also share a few similarities and several differences. Both want to improve and do their best. Shino, other than Naruto, was the only one to have some confidence in Hinata. He watched Hinata struggle to fight Neji, learned of how she wanted to change herself and came to realise she was improving. Likewise, Hinata has been shown to care about him when she worried for him in his fight and her look of fear when he blasted several feet back.
Kiba has shown that he cares for Hinata.
Of course Hinata care about Kiba, but when he's up against Naruto - no. She only has time for him then. He's the first on her list. At least this was how it was during their fight in the chuunin exams. Kiba coughed up blood and Hinata didn't even flinch, she was like "Yeah!" because Naruto won. Then when Naruto did the same she fainted. XD
I do notice this. It's hard to ship KibaHina when Kiba is pitted against Naruto. From Hinata wanted to cheer for Naruto to Kiba telling her to forfeit when Naruto told her to keep fighting.