Son Gokū

The Four-Tailed Beast was sealed within an elderly man of unknown origin who was eventually captured by Kisame Hoshigaki. Reportedly, it was a difficult battle for Kisame, who had to face many elemental fusions, rarely seen outside of kekkei genkai. The Four-Tailed Beast was extracted and sealed before the end of the next chapter, leading to the old man's death.
 * Name:
 * Creature type: Unknown
 * Host: None, formerly an unnamed elderly man
 * Unique traits: Access to many types of elemental chakra
 * Status: Captured, extracted, and sealed by the Akatsuki