Marine is a supporting character in Re:CREATORS and the illustrator of the light novel Elemental Symphony of Vogelchevalier. She is a young woman with short hair who wears glasses, and she first appears in the third episode of the series. Marine is depicted as a talented and hardworking illustrator, as well as a dynamic and sociable individual. She is primarily known for her work on the Vogelchevalier series, handling the illustrations for the light novel written by Takashi Matsubara.

Within the story, Marine takes on a practical and supportive role after the creations begin appearing in the real world. When the main character Sōta Mizushino is unable to continue housing the creations Selesia Upitiria and Meteora Österreich, Marine willingly provides them with a place to stay, taking custody of both characters. Her actions demonstrate a sense of responsibility and a willingness to help the creators and the creations caught up in the events.

Marine's motivations are linked to her role as a creator; she cares about the safety and well-being of the characters that originated from her creative work. Her key relationships are with Selesia, Meteora, and the other creators, though she does not directly participate in combat or the main confrontations. Instead, she serves as a grounding and supportive figure, using her real-world resources to assist the main group.

In terms of personal development, Marine does not undergo a major transformation but consistently acts as a reliable ally. Her notable abilities are limited to her professional skills as an illustrator, which are central to the fictional world that spawned Selesia and Charon. She does not possess any supernatural or combat powers, remaining firmly in the role of a human creator who supports the narrative from the background.