One popular theme is their loyalty to each other. In many fanfictions, they are shown standing by one another through tough times in the Soul Society. Another theme is their growth as characters. Writers often explore how they become stronger both physically and mentally over time.
The theme of friendship - turned - love is often explored. They start as friends or comrades in the Soul Society, and then their relationship blossoms into something more. There's also the theme of overcoming obstacles. These obstacles can be external, like the rules of the Soul Society, or internal, like their own insecurities. For instance, Renji may struggle with feeling worthy of Rukia's love, and the fic will be about how he overcomes that self - doubt while they build their relationship.
Another common theme is the 'what - if' scenarios. For instance, what if Renji had made different choices in certain situations regarding Rukia? This allows for a lot of creative exploration in the fanfictions. And also, stories about them having to work together against a common enemy while also dealing with their unspoken feelings for each other are quite popular.
A common theme is the power - up. Fans like to write about Ichigo and Rukia getting new powers and how they use them together. For instance, Ichigo might master a new form of his Zanpakuto and Rukia could gain a new Kido spell. They then use these new abilities to fight stronger enemies.
If we think about rukia, she is a character with a complex past and a strong sense of duty. Renji, her long - time friend and ally, has his own journey of growth. In rukia renji fanfictions, they might be shown as having a connection that goes beyond the ordinary, with rukia's cool exterior melting in front of renji, and renji being able to be more vulnerable around rukia. This can be explored in various non - adult ways in fanfiction.
One popular theme is power - up. In many 'bleach renji crossover fanfiction', Renji gains new powers or abilities from the crossover. For example, if he crosses into a world with magic, he might learn magic spells. Another theme is culture shock. When Renji enters a different universe, he has to deal with new cultures, like different social norms or ways of fighting. This can lead to some really interesting character moments.
Yes, there are many. You can start by looking on fanfiction platforms like FanFiction.net or Archive of Our Own. Search for stories tagged with 'Bleach', 'Renji', and 'Rukia'. Some stories focus on their friendship and growth within the Soul Society, which are really interesting to read.
The theme of sacrifice is quite common too. Renji may be willing to sacrifice his own well - being or position for Rukia's sake. Also, the theme of self - discovery. Through their relationship, they both discover new aspects of themselves. For instance, Rukia might discover a stronger side of herself because of Renji's support, and Renji might discover his capacity for deep love.
Another theme is redemption. For example, if there was a situation where Byakuya made a mistake regarding Rukia in the past, a fanfiction could be centered around his journey to make it up to her. This could involve him facing his own pride and learning to be more open with his feelings towards her.
I'm not sure about specific titles off - hand, but you can try looking on fanfiction.net. There are usually a lot of 'bleach renji x rukia fanfic' there. You can search by the tags 'Renji', 'Rukia' and 'Bleach'. Usually, the ones with high ratings are quite good. Some might explore their relationship in different AU (Alternate Universes) like a modern - day setting or a fantasy world different from the original Bleach universe.
Well, the theme of cooperation is quite common. They come from different worlds (Ichigo from the human world and Rukia and Renji from the Soul Society) and yet they have to cooperate to face threats. Also, the theme of sacrifice is there. In many fanfictions, one of them might be put in a situation where they have to sacrifice something for the others. And of course, the theme of love, not necessarily romantic love all the time, but love in the sense of caring deeply for each other and their shared values.