Well, it can be considered popular. It has a certain following. The world - building in 'ragna crimson light novel' is really appealing, which is one of the reasons for its popularity. Also, the character development is engaging, making readers want to keep reading to see how the characters grow and change throughout the story.
I'm not sure specifically what 'Cap deage' means. It could be a very specific term, a misspelling, or something relatively unknown. It might be a proper name, a local term in a certain area or a very niche concept.
Time travel forces Ragna to face his past, which can make him more self - aware. He may see the mistakes he made in the past and strive to correct them, leading to personal growth.
I don't have enough information to say exactly who Cap'n Kathy is. She could be an original character created by the fan fiction writer. Maybe she's a pirate - the 'cap'n' part could suggest that - who has some connection to the wizarding world of Harry Potter.
Cap cartoons are known for their creativity. They might have unique settings or fantasy elements. They often aim to entertain and capture the attention of the audience with their lively visuals and engaging stories.