Hyuuga Hiashi

On the day, the long war between the Leaf and the Cloud Village ended, and a peace treaty was made. Someone tried to kidnap Hinata and steal the Byakugan's secrets. The kidnapper was spotted, and easily taken care of by Hiashi. The kidnapper was the Cloud Village's head ninja. It's then when The Cloud accused the Leaf from breaking the peace treaty, and demanded Hiashi's body. It's obvious that the Cloud went to the Leaf Village with the intent to steal and reveal the secrets of the Byakugan all along.

But the Leaf, not wanting to risk another war, didn't decline their demand right away. And hosted a meeting with Hyuuga. Hiachi agreed to the matter, and was willing to die for the sake of the Leaf Village. But just when he was about to, Hizashi interfered.