One common theme is friendship development. They often start from being acquaintances or even having some misunderstandings, and then gradually become closer friends. Another theme is mutual support. They help each other out in various situations, whether it's dealing with personal problems or facing challenges together.
One common theme is friendship. Since Tooru is a part of Class 1 - A, many fanfictions explore her friendships with characters like Deku, Uraraka, and others. Another theme is her struggle with her invisibility quirk. Some fanfictions focus on how she copes with being overlooked or how she uses her quirk to her advantage in different situations. Also, there's often the theme of self - discovery as she tries to figure out who she is as a hero in training.
Another place could be FanFiction.net. There are many different fandom - related fanfics there, and you might be able to find some good ojiro x tooru ones. Just make sure to use the search function properly.
One popular ojiro x tooru fanfic might be about their adventures together in a fantasy world. They could be on a quest to save their land from an evil force, with Ojiro's strength and Tooru's quick thinking being key to their success.
Dazai is not based on a true story. Usually, characters like Dazai are formed through the author's imagination and artistic expression to create an engaging narrative for the readers.