Isshin the 12th

Isshin the 12th is a blacksmith and a negator that was saved by Fuuko and Yusai. He's was the holder of Unbreakable in the 101st loop and Haruka Yamaoka's grandfather before passing on at the start of the Sick Arc.

Negator War Arc
He is first seen struggling against an UMA. Just as he's about to be killed, Yusai manages to slay it and save him. Thankful, Isshin promises to repay them, but initially refuses to join the Union as he must protect his village in accordance to the village rules. He changes his mind and agrees to help after being told what his granddaughter did in the 100th loop, and vows to help until Unbreakable passes on to her. He then joins the effort in stopping the Bujora war in order to prevent Billy, Tella, and Creed's tragedies from unfolding, creating shields and blockades to defend everyone from gunfire, and later, aerial bombardment.

Unmove Arc
Following the recruitment of Shen, Feng, and Mui, he is drafted alongside nine others to infiltrate Chikara's school as its principal to prevent Chikara's tragedy. When UMA Colour appears, he and the other members leave the school to deal with it, with another person replacing him as principal and the school's memory of the Union being erased.

Abilities
Unbreakable: Anything forged by Isshin never breaks regardless of how severe the damage is, obtaining the Unbreakable kanji.

Equipment

 * Samurai Armor: An unbreakable armor that protects him from any harm.


 * Naginata: