Son Gokū

The is a demon formerly sealed within Rōshi of Iwagakure.

Background
It is called the Four Tailed Sokou (Yonbi Rat Shark). Its Jinchūriki, Rōshi, was defeated by Kisame Hoshigaki just before his introduction. According to Kisame, he had a difficult battle because he had to face the "Rat Shark"'s Lava Release.

Yonbi was later extracted and sealed, leading to Rōshi's death.

Activity inside Rōshi
Ability: Controls poison, poisonous gas, venoms, and also has the Lava Release Technique. As the host, Rōshi has made use of its Lava Release techniques, which is rarely seen outside of kekkei genkai.

השד בעל ארבעת הזנבות