Toshihiko Tsukiji is a Japanese light novelist, manga storywriter, and anime screenwriter recognized as the original creator behind several manga and anime works, including the series Kämpfer. His professional career began in the game industry, where he was associated with companies involved in tabletop role-playing games and play-by-mail games, such as Yuuentai and Hobby Data. During this early period, he occasionally used the pseudonym Toshiyuki Kurosu. He made his literary debut as a novelist in 1999 with the Light Sabers series under the Fujimi Fantasia Bunko label.

Tsukiji is credited with a substantial body of work across multiple publishing imprints. Among his most notable light novel series are Kämpfer, published by MF Bunko J, which served as the source material for both an anime and a manga adaptation; and Maburaho, published by Fujimi Fantasia Bunko. His other significant novel works include contributions to the Polyphonica series with the Blue arc under GA Bunko, the Kantai Collection -KanColle- novel Kagerou, Shukkotsu Shimasu! under Famitsu Bunko, as well as series like Sexual Hunter Riot and Hayate the Combat Butler novelization.

In addition to his novels, Tsukiji has worked directly in anime production as a screenwriter, contributing scripts for episodes of series such as Inukami! and Polyphonica. He has also been credited with the original story concept for the anime Umi Monogatari. His involvement in manga extends beyond providing source material, as he has also served as the storywriter for manga series such as Tokarev no Ayaui Shiro and Soutaisei Moteron.

Tsukiji is known for a distinct artistic identity characterized by a wide range of genres. He is self-described and widely recognized as a military enthusiast, often incorporating hard-boiled military and war scenarios into his narratives. This coexists with his prolific output of soft romantic comedies and harem stories, which frequently form the basis of his most famous works. His writing style is noted for its use of black comedy and a tendency to subvert narrative expectations, sometimes resulting in controversial or deliberately provocative endings. His significance in the industry is marked by a long-spanning career since the late 1990s, during which he has worked alongside other notable creators and has maintained a consistent presence in the light novel and anime landscape, with his works receiving both anime and manga adaptations.