Okkoto

Okkoto is a character from Princess Mononoke.

In film
Okkoto is an old boar god that took over Nago's place. Lord Okotto was blind and he and his warriors attempted an attack on the humans. All of his warriors died, and he got severely injured. Princess Mononoke guided him through a forest where human warriors disguised as Lord Okotto's own warriors snuck towards him. They then injected a piece of iron into him and left, effectively turning him into a demon. His life is then taken away by the forest spirit.

Trivia
According to Ghibli Official, Okkotonushi and Moro were once lovers until 100 years ago.