Seigen Kazamaki

Seigen Kazamaki (風巻 清弦, Kazamaki Seigen) is a ninja exorcist from the Kazamaki family and the grandfather of Matsuri Kazamaki.

Plot
One day, Seigen tells Matsuri about Ayakashi Medium and that Suzu is such. He explains that the ayakashi will want to eat her and wanting to protect her, Matsuri takes his training seriously.

Seigen congratulates Matsuri on job well done, but then hears the ayakashi called himself Shirogane and gets shocked. Seigen explains to Matsuri that this is the King of Ayakashi and gives him the God-Sealing Scroll, where he has been storing his power for 30 years. Matsuri manages to save Suzu, but Shirogane turns him into a girl. That surprises Seigen a bit, but he quickly gets used to it.

Shirogane ends up living at Kazamaki household, where Seigen comments that he is retired and is just watching idol videos and playing games, while Shirogane complains that his grandson is taking the King of Ayakashi, but Matsuri comes in and serves them dinner.

Etymology

 * The name Seigen means "clear, pure, clean" (清) (sei) and "string/bowstring, handle" (弦) (gen).
 * Seigen's surname Kazamaki means "wind, breeze, way, manner, blaster, gale, gust, sirocco, method" (風) (kaza) and "volume, roll, reel, book" (巻) (maki).