Gedoumaru is a Shikigami of the Ketsuno Clan. She was given to Sakata Gintoki of the Yorozuya as a precaution, during the Exorcist Chapter, by Ketsuno Ana, who had requested the Yorozuya's assistance.  Cold and relentless, Gedoumaru will do anything to beat her opponent, as seen in Episode 195 when she tricked the other Shikigami into thinking her mother had just died, when it was all just an act to get them to lower their guard. If her master shows any sign of weaknesses, she will turn on him.   Gedoumaru was caught by the Ketsuno clan when she was tearing up Mt. Oe during the Heian period, and was forced to serve them ever since, as told by Gedoumaru herself in Episode 195.

Life isn't easy in feudal Japan... especially since the aliens landed and conquered everything! Oh sure, the new health care is great, but the public ban on the use of swords has left a lot of defeated samurai with a difficult decision to make concerning their future career paths! This is especially true if, as in the case of Gintoki Sakata, they're not particularly inclined towards holding a day job, which is why Gintoki's opted for the freelance route, taking any job that's offered to him as long as the financial remuneration sounds right. Unfortunately, in a brave new world filled with stray bug-eyed monsters, upwardly mobile Yakuza and overly ambitious E.T. entrepreneurs, those jobs usually don't pay as well as they should for the pain, suffering and indignities endured! 
(Source: Sentai Filmworks)

__Non-Anime Roles:__
~!- Shenhe - Genshin Impact (VG)
- Sugar - Goddess of Victory: Nikke (VG)
- Nayuta - Goddess of Victory: Nikke (VG)
- Dikke - Reverse: 1999 (VG)
- Bianca - Punishing: Gray Raven (VG)
- Lion Ushiromiya - Umineko: When They Cry (VG)!~

After a one-year hiatus, Shinpachi Shimura returns to Edo, only to stumble upon a shocking surprise: Gintoki and Kagura, his fellow Yorozuya members, have become completely different characters! Fleeing from the Yorozuya headquarters in confusion, Shinpachi finds that all the denizens of Edo have undergone impossibly extreme changes, in both appearance and personality. Most unbelievably, his sister Otae has married the Shinsengumi chief and shameless stalker Isao Kondou and is pregnant with their first child.
 
Bewildered, Shinpachi agrees to join the Shinsengumi at Otae and Kondou's request and finds even more startling transformations afoot both in and out of the ranks of the the organization. However, discovering that Vice Chief Toushirou Hijikata has remained unchanged, Shinpachi and his unlikely Shinsengumi ally set out to return the city of Edo to how they remember it.
 
With even more dirty jokes, tongue-in-cheek parodies, and shameless references, Gintama' follows the Yorozuya team through more of their misadventures in the vibrant, alien-filled world of Edo.
 
(Source: MAL Rewrite)

The samurai didn't stand a chance. First, the aliens invaded Japan. Next, they took all the jobs. And then they confiscated everyone's swords. So what does a hotheaded former samurai like Sakata "Gin" Gintoki do to make ends meet? Take any odd job that comes his way, even if it means losing his dignity.
 
(Source: VIZ Media)
 
Included Bonus Chapters: 
Volume 1: Dandelion (One-shot). 
Volume 2: Shirokuro (One-shot). 
Volume 24: 13 (One-shot). 
Volume 38: Bankara-san Ga Tooru (One-shot). 
Volume 41: Special Lesson.

Utsuro's ultimate plan is revealed: spark a universal war that will ultimately lead to the destruction of Earth, allowing him to finally die but taking the universe down with him. Gintoki and others must team up with old allies and former enemies to not only defeat him but also the victims of the immortal's plans, a gathering army of vengeful Amanto who may no longer listen to reason.