Another plot could be that the reader is a Quincy in disguise and infiltrates the Soul Society. As they interact with the characters there, they start to question their own motives and loyalties, especially when they develop feelings for a Soul Reaper.
A possible plot is the reader being from the human world but gets caught up in the conflict between Hollows and Soul Reapers. Maybe they have a special connection to a powerful Hollow that no one else understands, and this draws the attention of the main Bleach characters.
Well, an interesting plot might be that the reader is a princess of an island that Luffy visits. The reader is not used to Luffy's wild and carefree ways at first but is intrigued by his sense of justice. As Luffy helps the island against some external threats, the reader and Luffy spend more time together. The reader then decides to leave her princess life behind and join Luffy on his journey, and during this journey, their relationship evolves into a love story. Another plot could be that the reader is a mermaid and Luffy saves her from some evil fishermen. Luffy is fascinated by the reader's mermaid abilities and the reader is attracted to Luffy's bravery, and so love starts to bloom.
Another plot could involve the reader being a part of the Capitol's elite, but having different ideals than Snow. They could engage in a battle of wits and ideologies, which might lead to an unexpected romance. In this type of story, there would be a lot of political intrigue and power plays.
Another plot might involve the male reader being from a different dimension and the Dazzlings are intrigued by his unique perspective on music and magic. They try to use his knowledge for their own gain but end up learning valuable lessons about friendship and cooperation instead.
One interesting plot could be Hisoka becoming overly possessive when the reader starts getting close to another character. He might start to eliminate any potential threats in a very Hisoka - like, unpredictable way.
One interesting plot could be a story where the reader has some sort of special power that Ichigo discovers. He then tries to help the reader control it while they also face various Hollow threats together. This creates a bond between them that goes beyond the normal hero - sidekick relationship.
Another plot could involve the reader being from a different social class than the showman and his troupe. There are challenges and prejudices to overcome as they try to fit in and be part of the show. The story could focus on how the reader uses their own charm and skills to break down barriers and eventually find love within the group. Maybe with Phillip Carlyle, who is initially hesitant but then falls for the reader's spirit.
In some 'evil superman x reader fanfiction', there could be a plot where the reader is the only one who can see the good that still exists deep within the evil Superman. The reader tries to bring out that good, leading to a series of intense and emotional interactions between them. It's like a battle between the evil side of Superman and the potential for redemption that the reader believes in.
A plot might involve a yandere legendary Pokemon like Mewtwo falling for the reader. Mewtwo could use its psychic powers to manipulate situations so that the reader has no choice but to be with it. It might create illusions to scare away potential rivals or even control the reader's thoughts to some extent.
There are many great 'bleach x reader' fanfictions that are not lemon. You can start by looking on platforms like Fanfiction.net or Archive of Our Own. Some popular ones might focus on the friendship between the reader and the Bleach characters, or on adventure - themed stories where the reader joins the characters in their battles against Hollows. For example, there could be a story where the reader has a special power and teams up with Ichigo to protect Karakura Town.
One interesting plot could be Eyeless Jack protecting the baby reader from other dangerous entities in the fictional world. Maybe the baby has some special power that Jack is drawn to and he feels compelled to keep it safe.