Tokugawa Soyo also known as Soyo Hime (そよ姫) is the younger sister of Tokugawa Shige Shige.
Since her father died, Rotten Maizou has served as her guardian and she views Maizou as a fatherly figure.
However, after her brother's poisoning and subsequent death at the hands of one of Nobu Nobu's assassin's, Soyo Hime becomes saddened and depressed at the loss of her older brother.
When she disguise herself as a normal civilian, she wore a green kimono with orange patterns. Soyo Hime is 14 years old the same age as Kagura.
- Tokugawa Shige Shige: She affectionately calls him "Dear Brother". She often prepare foul tasting tea for him, claiming that it is delicious when freshly poured. Shige Shige is used to her playful antics, as shown in the Courtesan Arc when he stepped out of his room to gently berate her for the noise.
Friends & Allies
- Imai Nobume: Nobume was assigned as her guard in the Courtesan arc, Soyo often sleep beside Nobume, implying they had a close relationship. They worked well together to scare the imperial guards off and she is called the Three Sadistic Sisters along with Kagura and Soyo.
- Kagura: In Episode 14 She met Kagura when she ran away from the castle and Kagura showed her around Kabukichou, by the end of the day, they became best friends. Soyo is often influenced by Kagura as she grew to love the Sukonbu snack and tell dirty jokes (which Gintoki smack Kagura's head for). she is called the Three Sadistic Sisters along with Nobume and Soyo.
- Okita Sougo: In Episode 297 Sougo helped Soyo to prepare for Kagura's funeral. Later in the Shogun Assasination Arc, he protected her from the insurgents, including Kamui who attempted to shoot her down as he sees her as a dead-weight. Sougo escaped with Jiiya and Soyo when the ship went down and she expressed her utmost gratitude to his efforts, despite him feeling inadequate in the failed mission.
Spent half a day with the 'Queen of Kabuki District' Kagura when she escaped from the palace due to boredom and loneliness, and got hooked on sukonbu as a result.
Sakata Gintoki was asked by Tayuu Suruzan to help her look for the man who made a promise to her. Yorozuya and Hyakka went looking for clues until they speculated that the person they're looking for was the former Shogun.
She helped Yorozuya and Tsukuyo to enter the castle. Soyo Hime was thrilled to see Kagura again, although Rotten Maizou thought it was improper for her to act like that. Gintoki was shocked when Kagura knew a higher status person than him.
When Yorozuya, Nobume and Tsukuyo found out Tokugawa Sada Sada was using Suruzan as a bait for assassinations, Sada Sada used this opportunity to order the Naraku to assault Sasaki Isaburo and frame it on Yorozuya, Tsukuyo and Imai Nobume.
Yorozuya, Tsukuyo and Imai Nobume were thrown in prison waiting for their execution. When things became hopeless, Soyo Hime at the time felt lonely so she sneaked in the prison while the Shinsengumi fought amongst itself to create a diversion. Soyo Hime told a story that involves the promise between Suruzan and her lover. It turned out that it was Jiiya who made the promise.
After hearing that Jiiya was the servant that had to endure Tokugawa Sada Sada's punishment. She wanted to help Jiiya no matter how many times he'll scold her but ended up unconscious due to her klutziness. Kagura hid her in a bush.
After waking up, she rushed to Jiiya's side and was relieved that Shinpachi and Kagura protected him from the guards. She was glad that she didn't lose another father. The Shogun wants Jiiya to go to Suruzan to keep his promise and asked Soyo to take care of Jiiya before confronting his uncle.