Heizō "Onihei" Hasegawa
The current head of the Edo Arson and Theft Control office, he's in charge of investigating and resolving arson/robbery cases throughout Edo.
- Authority Equals Asskicking: Many a mook will try to take a slash at him. They don't live.
- Generation Xerox: Is the current head of the ATC after his father passed away.
- Red Baron: Known in the criminal underworld as Onihei for his fierce katana skills.
Hisae Hasegawa
The wife of Heizō.
- Only Sane Man: Or rather woman. She gets mad easily when she hears Heizō or Tatsuzō mention about fighting with the risk of being killed.
Tatsuzō Hasegawa
The biological son of Heizō and Hisae and the adopted older brother of Ojun.
Ojun Hasegawa
The adopted daughter of Heizō and Hisae and the adopted younger sister of Tatsuzō.
- Happily Adopted: Ojun was the daughter of a thief Heizo apprehended and consequently took her in as his own. She doesn't mind one bit.
Chūgo Kimura
One of the dōshinsnote under the ATC.
Yasugorō Koyanagi
One of the dōshins under the ATC.
Chūsuke Sajima
In charge of the dōshins under the ATC.
Yūsuke Sakai
In charge of the yorikisnote They usually lead under the ATC.
- Number Two: Second in command of the ATC, given his samurai rank.
Hikojū
An experienced spy working under Heizō's information network.
- Cool Old Guy: He's an experienced spy, but he's a nice guy who doesn't mind sitting down to gamble once in a while.
- The Gambler: Hikojū enjoys doing so as a past time. His time in the mansion of a known vassal was key for the ATC to break in and arrest him for extortion and attempted murder.
Omasa
An experienced spy working under Heizō's information network. Said to have feelings for him.—-
Kumehachi
An ex-thief who was reformed after Heizō recruited him, working under the ATC directly. His rank is Okappiki.
- Big Damn Heroes: Saves him from being killed in "The Evil Scent of Hakubaiko" by pelting the assassin with a rock.
- Honor Among Thieves: In "Tanbei of Chigashira", the thief Kumehachi will not betray his comrades, even though they abandoned him for the police to find. Not even after hours and hours of torture.