He had a muscular build. He also wore a mask that resembled the face of a demon fitting his moniker.
Yamada hunted for challenges in order to test his own strength, even killing investigators to do so.
He was killed by Shinohara.
Power and Abilities
Ghoul Physiology: Demon Yamada was a bikaku ghoul, which granted him increased regeneration and durability, as well as agility and strength apart from his kagune. He was presumably a strong ghoul, having gained an S-rating through killing numerous First Class and Associate Special Class ghoul investigators before he was defeated.
- Bikaku Kagune: He had a bikaku kagune that took form as a long butcher knife.