Well, 'A Certain Scientific Railgun' (Toaru Kagaku no Railgun) is also well - known. It focuses on the story of Mikoto Misaka, a powerful esper, and her adventures in Academy City. It's related to the 'A Certain Magical Index' series and has gained a large fan base for its action - packed plot and interesting characters.
I'm not entirely sure which specific 'light novel to aru' you are referring to. There could be many light novels with 'to aru' in the title. Generally, light novels often feature elements like unique characters, interesting story settings, and a mix of different genres such as fantasy, science - fiction, or slice - of - life.
One idea could be to write a fanfic about an alternate adventure where Aru and her friends encounter a different set of challenges on their quest for the nectar of immortality. Maybe they face a new villain who has a unique power that they have to figure out how to overcome.
One common theme is mystery. Since Akise is a rather enigmatic character, many fanfics build on this aspect, creating complex plots full of secrets. Another theme is friendship, showing how Akise interacts with other characters in different ways.
The 'light novel to aru majutsu no index' is a complex and exciting story. It takes place in a universe where magic and science are two major forces. Index, a young girl, has all the grimoires of the world stored in her mind, which makes her a target. Kamijou Touma, with his Imagine Breaker ability, gets dragged into the world of magic and science battles. The story is full of action - packed scenes, character development, and exploration of the relationship between magic and science. There are also different organizations and characters with their own motives, which makes the story very engaging.
I'm not entirely sure what 'Cuboid Aru' specifically is. It could be a very unique or made - up concept. Without more context, it's difficult to determine its relation to an origin story. Maybe it's a character in a game or a specific object in a fictional world, and the origin story might explain how it came to be, its purpose, or its significance in that particular context.
A great Akise Aru x Reader fanfic often has a strong characterization of Akise Aru. The writer should capture his intelligence, his calm demeanor, and his loyalty. The relationship between Akise Aru and the reader should also be developed in a believable way. It can't feel forced or out of character.