In the light novel, Ayanokoji is clearly the more intelligent one. He has a unique ability to analyze situations and people's motives deeply. Ryuen often falls into Ayanokoji's traps because he doesn't fully understand Ayanokoji's true nature. Ayanokoji can anticipate Ryuen's moves and counter them effectively, while Ryuen struggles to keep up with Ayanokoji's complex thinking.
One major difference is the pacing. The anime might have a faster pacing to fit into the episode format, while the light novel can take its time to develop characters and plotlines in more detail. For example, in the light novel, there could be more in - depth internal monologues of the characters which might be cut short in the anime for the sake of time.
The light novel could be more popular among hardcore fans who really want to dig deep into the story and characters. Since the light novel has more details, it allows for a more in - depth exploration. Some readers might enjoy the process of using their own imagination while reading, rather than having a set visual from the anime. Also, the light novel was first, so die - hard fans of the original work might stick with it.
When Ayanokoji says 'I'll use any means necessary to achieve my goal', it reveals his somewhat ruthless side. He is not bound by conventional moralities when it comes to reaching his objectives. In the light novel, this could be a result of the cut - throat environment he is in. However, it also makes him a complex character as readers are left to question whether his actions are justifiable or not.
Well, Hachiman in the light novel is a character that many can relate to in some ways. He is like an outsider looking in on the social world of high school. His internal monologues are very revealing of his character. They show his insecurities, his hopes, and his rather jaded view of the world. Through his eyes, we get to see the different social dynamics at play in the school setting, and how he tries to navigate through them, often in his own unorthodox way.
The development can also be based on personal growth. Horikita is often very focused on her own goals and can be a bit cold. Ayanokoji could be the one to help her see the importance of relationships. Maybe he shows her how a more empathetic approach can help in achieving their class's success. This would lead to Horikita opening up to him more, and Ayanokoji in turn would start to show more of his true self to her. Over time, a deeper relationship could form as they both grow as individuals within the context of the fanfic.
Sure, Oregairu has a manga. The manga expands on the story and characters from the original source material. It offers a different perspective and more detailed plotlines.