He was invited with Spriggan story writer Hiroshi Takashige to go to a comic convention in Portugal in 1996 as a guest of honor due to his work on Spriggan. He worked on other manga comics before he went on to create Project ARMS with fellow manga artist, Kyoichi Nanatsuki.
His first name is sometimes transliterated as Ryouji.
Minagawa was born in Sumida, Tokyo, Japan. He made his manga debut with the comic HEAVEN in 1988. From 1991 to 1996, he worked with fellow artist Hiroshi Takashige in working on the 11 volumes of Spriggan. His work had brought him fame across North America and Europe.
After work on Spriggan was complete, he went on to do Kyo in 1996, followed by the creation of Project Arms from 1997-2002.
He is currently attending to work on a new manga called Peacemaker, serializing in Ultra Jump. Subsequently, he has done another manga called ADAMAS, which had been serialized in Kodansha's Evening magazine.
HEAVEN (1988): Original Creator
Spriggan (1991-1996) : Art
Kyo (1996): Original Creator
Project ARMS (manga: 1997-2002) : Original creator
Project ARMS (TV: 1997-2002) : Original creator
D-Live!! (2003-2006): Original Creator
S.O.L. (2006): Original Creator
Intruder: Original Creator
Peacemaker (2007): Original Creator
ADAMAS (2007): Original Creator
Kiddy Grade (TV) : Eyecatch Illustration (ep 14)
Critical Blow (Playstation): Character Designer
Genei Tougi: Shadow Struggle (Playstation): Character Designer
Project ARMS (Playstation 2): Original Creator
Spriggan: Lunar Verse (Playstation): Original Creator
Tekken 5 (Playstation 2): Marshall Law Character Designer
Tekken 6 (Playstation 3, Xbox 360): Roger Jr. 3P Model Designer
Tsukiyo ni Saraba (Playstation 2): Character Designer
- Minagawa contributed an illustration for the Metal Gear Solid Premium Package edition released in Japan, which is featured in the Metal Gear Solid Classified booklet. The artwork depicts the six main members of FOXHOUND, the antagonists in the game.