Isshin Matoi

Isshin Matoi (纏 一身) is the late father of Ryūko Matoi and the man who created Senketsu. He was a scientist who researched Life Fibers. Nui Harime claims to be responsible for his murder.

Appearance
Isshin Matoi is a very old man. He has a thin frame, a hunched back, white hair and a very long beard. His clothes are ragged and he uses an eyepatch in his right eye.

It is possible that he made Senketsu in his image, since his eyepatch and mustache greatly resemble Senketsu's features.

History
Isshin was a scientist who worked alongside Tsumugu Kinagase, Aikurō Mikisugi and Kinue in his research of Life Fibers.

Six months before the events of the main story, Isshin sent a letter to his daughter, Ryūko, asking her to have a conversation. When she got there, however, she found him laying on the ground with a red Scissor Blade driven through his body. He told her that, if she wanted to have a peaceful life, she was to leave him there and walk away. If she wished to fight in his place, however, she should take the very Scissor Blade that was used to wound him. According to him, she would be sure to find Isshin's assailant, but a cruel fate would be in store for her.

Before he could say anything else, Ryūko saw an unidentifiable individual wielding another Scissor Blade. With the blade that wounded Isshin, she immediately gave chase, ignoring the pleas of her father, who said he still had much to say. The mansion then exploded, Isshin still inside.

At some point before his death, he sent a letter to Aikurō asking him to lead Ryūko to Senketsu.

Relationships
Ryūko Matoi

"According to Ryūko herself, they never had a close relationship and were constantly at odds with each other. Isshin spent a great part of his time with his research, leaving him little time to spend with his daughter, which, added to the lack of a mother, led her to lead a lonely life and become a juvenile delinquent. However, he obviously cared for her, as seen when he sent a letter to Aikurō requesting him to aid her."