|Hair||Short, black w/ bright red mohawk|
|• Professional information•|
Nudist Beach operative
|Uniform||Nudist Beach guerilla uniform|
|Weapon|| Sewing machine guns|
Anti-Life Fibers needles
Various Traps and Explosives
Dōtonbori Robo (a.k.a. DTR)
|• Personal information•|
|Family||Kinue Kinagase (sister, deceased)|
|Friends|| Aikurō Mikisugi|
Isshin Matoi / Sōichirō Kiryūin (deceased)
Kinue Kinagase (deceased)
|Allies|| Aikurō Mikisugi|
|Enemies|| Ragyō Kiryūin|
|• First appearance•|
|• Voice actors•|
- “There are two things you need to know.”—Tsumugu's commonly used catchphrase
Tsumugu is a tall, muscular man, possibly in his early or late twenties. He keeps his hair short and black with the exception of his bright red mohawk. He has thick eyebrows, two earrings in his left ear and a bandage on his nose. In later scenes, he is shown with his eye blue. His attire is reminiscent of a guerrilla army member's gear in that it consists of a high-collared vest and dark green pants draped with belts and ammo. It is worth noting that he shares a physical trait with Ryūko Matoi - namely, the black hair with a red streak.
Tsumugu has a keen hatred for Life Fiber uniforms, especially Kamui, as he believes that they are merely relying on their wearers as a food source and will eventually kill their wearer. He also does not respect anyone who relies on Life Fibers. However, despite his hate for Kamui, Tsumugu accepts that Senketsu truly cares for Ryūko after being threatened by him and chooses to save them from Nonon Jakuzure when they were cornered by her.
He is a very serious and focused individual, and has a habit of listing two reasons that apply to any given situation (usually a mistake done by his given opponent) and is frequently seen smoking.
In the past, Tsumugu used to work under Isshin Matoi as a scientist in the research of Life Fibers, together with his older sister, Kinue, who was very close to him. When Kinue, believing that people and clothing can form a bond together, decided to become a willing test subject for the wearing of an unspecified Kamui, the test failed tragically as Kinue was overwhelmed by the Kamui and devoured right in front of Tsumugu's eyes. This incident sparked in him an intense hatred for Life Fibers and Kamui and his initial belief that clothing and people can never truly care for one another, resulting in him becoming a hunter for Nudist Beach.
Tsumugu is shown to be very tough, as he is able to hold his own against the Goku Uniform-clad club leaders without wearing any ability-enhancing clothing himself. He fights with equipment capable of disabling anything composed of Life Fibers. He most frequently uses a sewing machine shaped gun that fires alloy-based acupuncture needles that are shaped like sewing needles that can cause Life-Fiber-based clothing to desynchronize with their wearer. He also uses thread spool shaped grenades and smoke bombs to cause collateral damage, and is equipped with special firing pins mounted in gauntlets on his wrists. The pockets of his military vest can also function as a large-scale smoke bomb.
Tsumugu is very skilled at setting traps, disabling his Life-Fiber-using opponents, and stealth tactics, being capable of incapacitating Ryūko while in "Kamui" mode Senketsu through his tactical aptitude.
Kinue was Tsumugu's sister. Little is known about their relationship, but she appears to have been close to Tsumugu - enough to give him a burning hatred of Life Fibers when Kinue was consumed by them.
In the past, Tsumugu worked alongside Isshin Matoi researching Life Fibers.
Both Aikurō and Tsumugu are operatives of the Nudist Beach rebel group. Tsumugu claims he has a debt to pay with Aikurō and that he'll do whatever he asks, except when it comes to a Kamui.
Tsumugu initially tries to take Senketsu away from Ryūko, to protect her from dying the same way Kinue had. However, he eventually accepts that Ryūko and Senketsu really do care for each other.
- “I owe you a debt. I'll do anything you ask. Except when it comes to a Kamui.”—Tsumugu making clear his restrictions to Aikurō
- “You're telling me that she's trying to make the Earth wear clothes?”—When Satsuki explains Ragyō's plan to the others
- Main article: Tsumugu Kinagase/Image Gallery
- According to Creative Director, Shigeto Koyama, Tsumugu's outfit was directly inspired by Marvel's Agent Venom.
- Tsumugu was originally going to have a pink Mohawk. 
|Allies||Ryūko Matoi • Senketsu • Mako Mankanshoku • Mankanshoku Family (Barazō Mankanshoku • Sukuyo Mankanshoku • Matarō Mankanshoku • Guts)|
|Nudist Beach||Sōichirō Kiryūin • Aikurō Mikisugi • Tsumugu Kinagase • Kinue Kinagase|
|Student Council||Satsuki Kiryūin • Junketsu • Ira Gamagōri • Uzu Sanageyama • Nonon Jakuzure • Hōka Inumuta • Shirō Iori|
|Club Presidents||Takaharu Fukuroda • Omiko Hakodate • Maiko Ōgure • Aizenbō Fuguhara • Maimu Okurahama • Masuyo Watari • Jack Naitō • Tatamu Otte • Kagesaburō Kagerō • Kusanosuke Yaguruma • Kusatao Uwabami • Tōki Brothers • Ryōsuke Todoroki|
|Revocs Corp.||Ragyō Kiryūin • Nui Harime • Rei Hōōmaru|