One major difference is how the characters are developed. In the Arifureta light novel, the author has more space to explore the characters' personalities, motives, and growth over time. There can be long paragraphs of introspection. In the manga, character development is shown more through their expressions and actions in the panels. Additionally, the plot progression in the light novel may follow a more linear and detailed path, while the manga might take some creative liberties to make the story more engaging in a visual medium, like skipping some minor details and focusing more on the exciting parts.