None.

A few episodes contains a fair amount of mild blood.

Weapons such as knifes, swords, and guns are seen and used frequently throughout the series.

One episode features one the main characters catching the blade of a sword and blood comes out of his hand.

Another episode features a main character getting a huge scrape and blood is shown.

Another character gets scraped on his face and blood comes out. (He covers his face though).

A character gets shot by a bullet in one episode and blood is seen.

None.