Ryōichi Ikegami (池上遼一) is a manga artist. He was assistant to manga artist Shigeru Mizuki in 1966. In 2001, he won the Shogakukan Manga Award for general manga as the artist of Heat. He became a professor at Osaka University of Arts in 2005. Ikegami has worked on several popular series, such as Mai, the Psychic Girl with writer Kazuya Kudo, Crying Freeman, with writer Kazuo Koike, as well as Sanctuary and Heat with writer Sho Fumimura. He also wrote and drew Spider-Man: The Manga, a manga version of Spider-Man and collaborated with Garon Tsuchiya for the manga BOX (BOX 暗い箱). His most recent work is Lord currently serialized in Big Comic Superior.

Kazuo Koike (小池一夫, Koike Kazuo) was a prolific Japanese manga writer, novelist and entrepreneur. Early in Koike's career, he studied under Golgo 13 creator Takao Saito and served as a writer on the series. Koike, along with artist Goseki Kojima, made the manga Kozure Okami (Lone Wolf and Cub), and Koike also contributed to the scripts for the 1970s film adaptations of the series, which starred famous Japanese actor Tomisaburo Wakayama. Koike and Kojima became known as the "Golden Duo" because of the success of Lone Wolf and Cub. Another series written by Koike, Crying Freeman, which was illustrated by Ryoichi Ikegami, was adapted into a 1995 live-action film by French director Christophe Gans. Kazuo Koike started the Gekika Sonjuku, a college course meant to teach people how to be mangaka. In addition to his more violent, action-oriented manga, Koike, an avid golfer, has also written golf manga.