- His real name is Tokuda Sueo.
- He first met Izumi Kyouka when he and a friend came to Tokyo resolving to become writers and went to see Ozaki Kouyou, the most prominent writer of the literary world at the time. Kyouka turned them away, but accepted their manuscripts for Kouyou to read. Kouyou ultimately returned the manuscripts. Half a year later he returned to Tokyo and met Kyouka again, who encouraged him to become Kouyou's pupil.
- Among Kouyou's disciples, Shuusei was a different presence. He took political issues more seriously; his works dealt with class conflicts, discrimination, womens' rights, etc., themes that are also present in Shimazaki Touson and Arishima Takeo's works.
- After Kouyou's death in 1903, while other members of Kouyou's group polished formulas inherited from the past, like Izumi Kyouka, Shuusei incorporated other stylistic innovations to meet the challenges of the naturalism genre. He was the only one of Kouyou's disciples to survive as a professional realist novelist into the second decade of the twentieth century.
- Kawabata Yasunari wrote that Shuusei was 'a master of the novel, a master that maintained no school and who was the most Japanese of all modern novelists in the sense of being in touch with his own society.'
- His works are generally dark and depressing. His characters lead meaningless lives, finding their only pleasures in the senses. Kunikida Doppo is said to have remarked on his deathbed that no one in his condition would want to read a novel by Shuusei.
- He died at age 71 due to pleural cancer.
- By some definitions, he can be considered the personification of Japanese naturalism as a period when the nation has entered a new stage of self-awareness and gained a new perspective to their own humanity.
- He, Izumi Kyouka, Yanagawa Shunyo & Oguri Fuyo were called the Shitenno (Four Heavenly Kings).