Katamaru

Katamaru is the most famous shinobi in history and the creator of the katana.

Background:
Nothing is known about his background.

During War:
He was a great warrior... and he even scared death. Sometime during the war: he built a sword named after him, the katana. His actions in war are shorded in mystery.

Fate:
Sometime in the past: he was killed by an unknown weapon from an unknown person.

Trivia:

 * Katamaru is said to live inside his first katana.