One common theme is growth. Since Ichigo is depicted as little, his journey of becoming stronger and more aware of his powers is often explored. Another theme could be friendship, like how his relationships with his friends in Karakura Town develop at an earlier stage.
One common theme is the exploration of gender differences. Since Ichigo is female in these fanfictions, it often looks at how she is treated differently in the male - dominated Soul Society. Another theme is relationships. It could be her relationships with her friends like Chad and Orihime, but also her romantic relationships which might be different from the original story.
One common theme is friendship. Their relationship often starts as a rivalry but then transitions into a deep friendship. Another theme is mutual respect. They learn to respect each other's powers and abilities.
Well, often there are themes related to their powers. For instance, how they combine their abilities to overcome a powerful foe. Also, there can be themes about their pasts. Maybe exploring how their childhoods or family histories influence their current relationship. Some fanfictions might also have a theme of sacrifice, where one of them is willing to give up something for the other's sake. This can add a lot of depth to their relationship in the story.
One common theme is the exploration of Ichigo's inner struggle. In lemon fanfiction, it might be intertwined with his Hollowfied state, like his fight to control his new, darker powers while also dealing with romantic or sensual elements. Another theme could be the relationship between Ichigo and other characters, such as how they react to his Hollowfied form in a more romantic or intimate context.
One common theme is domestic bliss. Writers often show them having a normal life at home in Karakura Town.
One common theme is redemption. Ichigo often goes back in time to correct past mistakes, either his own or those of others. This gives characters a second chance at making things right.
Many 'little ichigo fanfiction' works have the theme of mystery. Given that Ichigo's father has secrets and the whole world of spirits is full of mysteries, when Ichigo is younger, he's starting to uncover these things. This can lead to exciting storylines where he's constantly learning new things about his family, his powers, and the hidden world around him. For example, he might start to suspect his father's true identity and embark on a little investigation of his own as a child, which makes for an engaging read.
One common theme is empowerment. Since Ichigo is often portrayed as a strong male character in the original, when she's female in the fanfic, it's about showing her strength in different ways. For example, she might face different challenges because of her gender but still overcome them.
One common theme is the struggle to regain strength. When Ichigo is injured, he has to fight his way back to his former power. Another theme is the support from friends. His comrades in Bleach, like Orihime and Chad, often play important roles in his recovery in fanfics.
A common theme is also the exploration of Ichigo's character growth in the context of these two different universes. In Bleach, he has his own journey of self - discovery and power development. When combined with the world of Rosario Vampire, there are new challenges and opportunities for him to grow. Writers often delve into how he adapts to the new situations, makes new friends or enemies, and how his moral compass might be affected by the different rules and cultures in the Rosario Vampire world while still maintaining his core values from Bleach.