Ryosuke Fuji is a Japanese manga artist whose professional career began with his role as an assistant to other manga creators, where his primary responsibility was drawing backgrounds and landscapes. His first serialized work as a lead artist was the official spin-off of Hajime Isayama's global hit, Attack on Titan: Lost Girls, which was published from 2015 to 2016. This series adapted Hiroshi Seko's light novel of the same name, allowing Fuji to explore untold stories of characters Mikasa Ackerman and Annie Leonhart within the established Attack on Titan universe.

Following this, Fuji worked on World End Crusaders, a darker series set in a dystopian world threatened by supernatural forces, which began publication in 2017. He also adapted the anime Fairy Gone into a manga in 2019. Fuji is best known as the artist for Shangri-La Frontier, a manga adaptation of Katarina's popular web novel that began serialization in Kodansha's Shonen Magazine in 2020. The series follows Rakuro Hizutome, a high schooler who specializes in beating poorly designed "trash games" but finds his skills tested when he enters the popular and well-crafted VR game Shangri-La Frontier.

When Fuji was first approached to draw the series, he was unfamiliar with the original web novel but became interested because he is a gamer himself and felt he could relate to the material. The creative collaboration involves Fuji reading the source material to create storyboards, after which editor feedback is incorporated and Katarina adds or adjusts text elements such as attack names and dialogue that were not present in the original novel. A recurring artistic technique Fuji employs to distinguish the two worlds in Shangri-La Frontier is his use of black ink. In the real-world sections of the story, he uses black more frequently, while in the scenes set inside the video game, he avoids heavy black fill to reserve it for depicting monsters and creating contrast.

His artistic style is generally characterized by dynamic action sequences and detailed character designs. Fuji has stated that the action movements in his panels are already visualized in his mind while drawing, which helps the adaptation to animation proceed smoothly. As a gamer, his own experiences influence his work; he has mentioned enjoying watching streams of games like Elden Ring and narrative-based RPGs, and he draws ideas from watching popular streamers to make the actions of his protagonist more exciting. The commercial success of his work is significant, with the Shangri-La Frontier manga surpassing twelve million copies in circulation worldwide. This popularity led to a two-season anime adaptation produced by studio C2C and the announcement of a video game adaptation, cementing the series as a major property in the isekai and game-themed genre.