I don't really know who ao chan is just from this statement. It could be a character from a specific story, game or anime that the speaker is familiar with.
It's hard to say for sure, but sometimes fanfics are taken down on AO3 if they don't meet the platform's quality standards or if there are legal issues involved. Could be one of those reasons for this particular one.
Maybe Ao Chan is too busy with other things. For example, schoolwork or real - life jobs can take up a lot of time and energy, leaving no time for studying fanfic.
I really like the fanfic 'Rin and Shiemi: A New Chapter'. It starts off with them going on a mission together. In this story, they have to rely on each other more than ever. It has some really cute moments where Rin tries to protect Shiemi in his own clumsy way, and Shiemi in turn helps Rin understand his powers better.
Well, 'Ao Haru Ride' is a great anime and the idea of a Kou x Futaba fanfic can be really interesting. A good fanfic in this pairing might explore their relationship further. It could delve into their feelings that were not fully shown in the anime, like the small moments of hesitation or the unspoken words between them.
One common theme is the clash of different power structures. In 'ao no exorcist', there are exorcist powers and demon - slaying swords, while in 'kuroshitsuji' there are demon contracts. When these two worlds cross, seeing how the characters with different power sources interact is a big theme.
It could mean that Ao Chan is unable to study fan fiction. Maybe Ao Chan gets too distracted by the fictional and often complex worlds in fanfics, or perhaps they lack the time to study fanfics while dealing with other important tasks.
Well, there could be a fanfic where Lucifer forms an unexpected alliance with an exorcist. This alliance could be born out of a mutual understanding of a greater threat that is looming over both the demon and human worlds. They have to put aside their differences and work together, which makes for a really exciting story.
Friendship is a very common theme. Their relationship, whether it's starting as rivals or comrades, often develops into a deep and meaningful friendship. Another theme is growth. They both grow as characters through their interactions with each other.