The Spirit of Lake Toya (洞爺湖 Tōya-ko) possesses the sword that Gintoki carries. Appearing in Chapter 150, he attempted to teach the Yorozuya an ultimate technique, the "Jumbolic Magnum," which sends the target flying into the sky with a single punch. A side-effect of the attack forces the victim to shed bodily fluids from his body. Unfortunately, none of the gang ever manage to learn the attack.

The spirit lives with his parents. His mother has an afro hairstyle with a white beard, and his father is constantly looking for a job. His father also has a sure kill technique, called the "Jack Nicolle," in which he shoots a beam from his bald spot. Toya also keeps a pet, and it sheds a large amount of curly hair. It is said that he was a fellow student to Taikobou, the main character of Hoshin Engi.

Lake Toya enjoys eating fried cuttlefish, as evidenced by the contents of his wastebasket. He claims the contents of his trash, strange smelling hardened tissue paper, are the remnants of the occasional cuttlefish feast, although Gintoki thinks otherwise. The spirit does keep a book collection of female figurines under his bed.

He is a parody of the character Zangetsu from manga Bleach.

Source: Wikipedia