She is best known for her character design and illustration work in the SaGa series of video games by Square Enix.
Kobayashi has been termed an "iconic" artist for Japanese role-playing games, and has had multiple artbooks published.
[2] When designing for Romancing SaGa 2, Kobayashi aimed to change things with her approach, but felt that the outcome was largely the same.
These designs were featured on porcelain plates (a process called "Arita-yaki") among other things, which were either used as presentation for the event or sold.
[4] She has been regarded as an iconic video game artist by multiple sources, including Shack News and Hobby Consolas.