Kouichi Aizawa

Age: 14 years
Birthday: 7/31
Height: 168 cm
Weight: 54 kg
Shoe size: 26 cm
Likes: Rabbit meat, reading (modern literature)
Dislikes: Rhetorical flourishes, historians
Specialty: Using the five elements, Japanese dancing
Fighting Style: Fukushima shinobi-style taught in the Banten area

Rokujo's 14-year-old classmate who studies nindō under Kumohira. Though he normally has an energetic attitude when around others, he is serious and relentless when it comes to his ninja duties, and is apparently fascinated with death.

He was born on July 31.