__Class:__ 1st-year Ha-class
__Committee:__ Explosives
__Occupation:__ Theory teacher, Advisor

A skilled and good-natured teacher, Doi is both strict and kind to his students. Despite his frequent stress-induced stomachaches caused by his class' poor academic standing, Doi remains persistent in trying to teach them, and believes in their practical abilities and individual talents. He is well-loved by his class, as well as the other nintama and staff of the Ninjutsu Academy. Outside of his job as a teacher, Doi works proficiently as a ninja. However, he is also shown frequently forgetting to pay his rent or attend town cleaning due to his busy life preparing make-up classes for the 1st-year Ha-class. He also shows a rather childish side when faced with his least favorite food.

Doi is of average build and height, with a slight baby-face. He has upturned eyes, a slightly pointed nose, and defined eyebrows. Notably, he has long, messy brown hair, but this is completely hidden when he wears his current ninja zukin or his casual hat, giving the illusion of short hair - usually, all that is visible is his characteristic bangs. In the past, this hair was tied in a messy ponytail.

~!Doi-sensei was brainwashed by Dokutake in the novel "Rakudai Ninja Rantarou: Dokutake Strongest Warrior," and had another persona known as Tenki. He eventually recovered his recollection and returned to his student. !~



Rantarou, Shinbei and Kirimaru are ninja apprentices in the Ninja Gakuen, where first grade ones are called "Nintamas" (contraction of the words ninja+tama (egg). They must learn everything a ninja must know, but as for our heroes, money, food or playing are more interesting. The series show the everyday adventures of our heroes, segmentated in a cartoon fashion, like 2 small episodes in a 30-min show. The cast also includes the teachers (Doi-sensei and crossdressing Yamada-sensei), nintama kunoichis, evil guys (Dokutake ninjas) and even family members of all the cast...
 
(Source: Anime News Network)

Holds a 2nd Dan rank in Kendo. A veteran Japanese voice actor who has played characters in anime, drama CDs and video games. Apart from voice work, Toshihiko Seki sometimes does live-action drama stage work and is a member of 81 Produce.

__Non-anime roles:__
• Dottore (Genshin Impact)
• Chongyue (Arknights)

Rantaro, Kirimaru, and Shinbei are far from being excellent ninjas. Training at an elite ninjutsu academy in historical Japan, they are accompanied by their tongue-in-cheek friends, ninja masters, and idol senior ninja trainees. Rantaro and his ninja-in-training pals are called "nintama" — a combination of "ninja" and "tamago" ("egg"). The story of the film begins when Doi-sensei disappears after being challenged to a duel by Moroizumi Sonnamon, a tasogaredoki ninja. While Yamada-sensei and the 6th graders of the Ninjutsu Academy search for Doi-sensei, a man dressed in white suddenly appears at the Academy!
 
(Source: Japanese Canadian Cultural Centre)

Ninjutsu school teacher Doi Hansuke goes missing after heading to a duel where he was challenged by Tasogaredoki Ninja Moroizumi Sonnamon.
 
Denzo Yamada and Tamatsu, a sixth-year student, hear about the situation and begin searching for the missing Doi.
 
Meanwhile, information comes in that there have been some disturbing movements at Dotake Castle, which has always been an enemy of the Ninjutsu Academy.﻿

Hansuke Doi