Seishu Inui

Seishu Inui, or Inupi (イヌピー) was the 10th Generation Black Dragon Attack Squad Captain after the Christmas Showdown he joined the Tokyo Manji Gang and became a member of the First Division. In an alternate timeline, he is the First Division Captain (壱番隊 隊長) of the Second Generation Tokyo Manji Gang. As of the final time leap, he is a Seventh Division Member of Toman. He is a major antagonist in the Black Dragon Arc.

Appearance
Inupi is of average height and has a slim build. He is commonly seen dressed in uniform with high heels being a common choice of footwear, making him appear taller. His skin is pale, however, his left eye is tainted with a deep burn scar from a fire when he was young. His middle parted sunflower blonde hair with an undercut contrasts his dark emerald eyes and neutral expressional face.

Two years later, Inupi's hair grows back to how it was during his third year of middle school.

Personality
Inupi is usually a stoic and quiet individual. However, he is not afraid to voice his thoughts and opinions even if it hurts him in the end. He is very committed to the Black Dragon and loyal to Hajime Kokonoi, who he considers his best friend. When he finds people he trusts, he devotes himself to them. He is brave but will be willing to show his vulnerable side and open up.

Inupi has shown great admiration to Black Dragon since his youth and wished to achieve the same thing previous Black Dragon generations did in the past. However, his devotion over Black Dragon has become very obsessive to the point Inupi wanted to revive the gang himself. He is greatly saddened that Black Dragon is no longer the same as it once was.

Authority
As the former 10th Generation leader of the Black Dragon, Inupi had control over a massive army of strong delinquents. Later, as he becomes Taiju's assistant, he still has authority over the gang's members, although to a lesser extent. He later becomes the First Division Captain of the Second Generation Tokyo Manji Gang, thus having authority over his division members.

Fighting Abilities
Inupi was unrivaled in a fight before meeting Taiju, making him a strong fighter in his own right. He has also utilized a pipe to knock out Takashi Mitsuya while the latter was fighting Taiju. During the battles against Tenjiku and Kanto Manji Gang, he was shown to swiftly take out multiple opponents at once. Inupi is also shown to be quite durable, when he fought against the Legendary Duo, Wakasa still commended him for his efforts.

Mechanical Knowledge
As an ardent follower of Shinichiro, Inupi inherited an abundance of mechanical knowledge from the bike expert.

Appearances
{{Appearances|Episodes|2==== Valhalla Arc ===
 * Episode 24 - A Cry baby
 * Episode 25 - It is what it is (visualized)

Black Dragon Arc

 * Episode 26 - Gotta go
 * Episode 27 - Stand alone
 * Episode 28 - Family bonds
 * Episode 30 - Whip up morale
 * Episode 31 - Sibling rivalry
 * Episode 32 - Strive together
 * Episode 33 - Dawning of a new era
 * Episode 35 - On my way home}}

Etymology

 * The name Seishu means "blue, green" (青) (sei) and "religion, sect, denomination, main point, origin, essence" (宗) (shu).
 * Seishu's surname Inui means "dried, cured, drought, dry, desiccate, drink up, heaven, emperor" (乾).

Trivia

 * According to the official character book:
 * His image color is bluish purple.
 * He likes blood donation.
 * He dislikes patience.
 * His special skill is ball games.
 * The person he looks up to or admires is Black Dragon First Generation Members.
 * The person he dislikes or fears is no one.
 * His dream is reconstructing The Black Dragons.
 * His favorite place is the S.S MOTORS.
 * His heroic/failure story: Once, an old man in his 40's came to S.S MOTORS. Inupi thought that man was the owner, so he said hello, and that man turned out to be Benkei. Is it true that Benkei is the same age as Shinichiro?
 * His favorite motorbike is the Yamaha RZ350.
 * Inupi ranked 14th in the Character Popularity Poll with a total number of 1148 votes.