Buso Renkin
Watsuki based "Buso Renkin"s characters and fictional elements on his previous works. He conceptualized Kazuki while imagining Makimachi Misao, and Tokiko was designed as a feminized version of Himura Kenshin from "Rurouni Kenshin". From the same series, Yukishiro Enishi and Yukishiro Tomoe served as inspiration for the Hayasaka twins; Inui Banjin and Otowa Hyōko for the homunculi Kinjo and Jinnai. Shusui Hayasaka's buso renkin, "Sword Samurai X", refers to the English name of "Rurouni Kenshin". Watsuki declared that Buster Baron is a "reincarnation" of the Armor Baron from "Gun Blaze West". In addition, Victor's buso renkin is named after the "X-Men" storyline of the same name.