Another theme is power discovery. The OC usually has some hidden power or ability that Yoruichi helps to unlock or develop, and together they become a stronger force. It could be a new type of spiritual power or a unique combat skill. Also, the theme of self - discovery is quite prevalent. As the OC interacts with Yoruichi, they learn more about themselves, their values, and their place in the world of Bleach. This often leads to character growth for the OC.
To develop their relationship, start with small interactions. For example, the OC could save Halibel from a surprise attack by other Hollows. This would make Halibel curious about the OC. Then, have them exchange stories about their lives. Halibel could talk about her rise to become an Espada and the OC could share their origin story. Another way is to give them a common goal, like protecting a group of innocent Hollows from a cruel Arrancar. Working together towards this goal would bring them closer.
Redemption is also a popular theme. Many male OC hollows start out as villains but then seek to redeem themselves. For example, they might try to make amends for the harm they've caused to other characters. Additionally, the theme of survival is often present. They have to survive in a world full of stronger enemies and complex power dynamics.
Another interesting one is 'Male OC: The Hidden Power'. This fanfiction delves into a male OC who discovers he has a hidden power that no one in the Bleach world has seen before. The plot unfolds as he tries to control this power while also dealing with the various factions in the Bleach universe, like the Soul Society and the Arrancars. It has a great balance between character exploration and the overarching plot.
A good one often has a well - developed original character. The character should have a unique personality, backstory, and goals. For example, if the OC is a Soul Reaper, their reasons for being in the Soul Society and their relationship with Gin Ichimaru should be interesting and believable.
For Zaraki, emphasize his love for combat. Show his internal struggle between his blood - thirsty nature and the new emotions that the OC brings out in him. For the OC, give them a distinct personality trait, like extreme loyalty or a sense of humor. Let their actions be guided by this trait. For example, if the OC is extremely loyal, they would stand by Zaraki no matter what the situation is.
One popular 'bleach yoruichi x oc fanfiction' is 'A New Bond'. It explores an interesting relationship between Yoruichi and an original character. The OC has unique abilities that interact well with Yoruichi's skills.
Well, for a Bleach Halibel x OC fanfiction, a plot could revolve around the OC being a time - traveler. The OC travels back in time and meets a younger Halibel before she became an Espada. This could change the course of Halibel's life and their relationship. Or, the OC could be a musician in the human world whose music can reach the spiritual realms. Halibel hears this music and is drawn to the human world to find the source, which is the OC. Also, the OC could have a special ability to communicate with water, just like Halibel has an affinity with water - based attacks. They could bond over this shared connection.
One idea could be that the OC is a powerful healer who joins Zaraki's squad. Their different outlooks on battle and life create an interesting dynamic. Zaraki, being all about combat strength, initially doesn't understand the value of the OC's healing abilities. But as they face tougher enemies together, he starts to see how crucial the OC is to the survival of the squad. This leads to a slow - building relationship between them.
You could create a female OC who is a Quincy with a unique weapon. For example, a Quincy who uses energy arrows that can change direction mid - flight. Her backstory could be that she was orphaned during a Hollow attack and was taken in by a group of Quincy who trained her. She could have a complex relationship with the main Bleach characters, like Ichigo. Maybe she initially sees him as a threat to the Quincy way but later comes to respect him.