Relationships in general are probably a key theme. This includes not just romantic relationships but also friendships and how they interact with the main plot.
One similar light novel could be 'Toradora!'. It also features complex relationships between characters in a school setting, much like 'fuufu ijou koibito miman light novel'.
Since I don't have detailed knowledge of 'watashi ga koibito light novel', it could potentially be about a love story. Maybe it tells the tale of a protagonist's search for love, their encounters with different people, and how they navigate the complex emotions that come with falling in love. It might also include elements of Japanese culture and society as light novels often do.
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.
I'm not sure specifically as I haven't read this particular light novel. It could potentially be about a character who has some extraordinary skill beyond the normal state of things, given the words 'jouji ijou skill' which might imply a supernormal ability in an abnormal frame.
Self - discovery could be a theme as Shirayukihime deals with her relationships with the seven. She might learn more about herself through these interactions.
I'm not very familiar with 'shirayukihime to 7 nin no koibito web novel'. It might be a relatively niche web novel. Maybe it's about a character named Shirayukihime and her relationships with seven lovers, but this is just speculation without further research.
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.