Maybe fem Ichigo has a different set of powers compared to Ichigo. In the fanfiction, they could train together to combine their powers in a unique way. For example, her powers might be more focused on defense while Ichigo's are on offense, and they learn to complement each other. This could lead to some interesting character development as they overcome their differences and work towards a common goal.
One idea could be that fem Ichigo is a new recruit in Urahara's shop, and they end up having to go on a secret mission together to save the Soul Society from a new threat. Along the way, a unique bond forms between them.
Another plot could be that there's a powerful enemy who tries to use Rukia and Ichigo's feelings against them. They have to fight not only the external threat but also their own growing desires for each other, which leads to some tense and steamy moments in the fanfiction.
One idea could be Ichigo struggling to control his new vampire instincts while still trying to protect his friends. He might have to hide his vampiric nature from his family, which adds a layer of secrecy and tension.
One idea could be Ichigo having to face new and more powerful enemies in his resurrected form. Maybe he discovers new powers that come with this resurrection and has to learn to control them quickly to save his friends.
One idea could be a story where Ichigo and Candice are forced to team up during a Hollow invasion in a new, unknown dimension. They start off distrusting each other but gradually learn to work together as they face stronger and stronger foes.
One idea could be to have Ichigo from 'Bleach' cross over into a world of a popular female - led anime like 'Sailor Moon'. He could team up with Sailor Moon to fight a new common enemy that threatens both their worlds. Their different fighting styles and powers would make for an exciting combination.
One idea could be that Ichigo has to go on a special mission with a group of characters and during the journey, they all discover new powers within themselves. For example, Ichigo could learn a new form of his zanpakuto from an unexpected ally.
One idea could be Ichigo being transported to a different anime world where he meets a harem of characters from that world. For example, if he ended up in the Naruto world, he could encounter female ninja who are intrigued by his unique powers and personality. Another plot could involve a magical spell that accidentally creates a harem situation for Ichigo in his own Bleach world, with various female characters suddenly having strong feelings for him. Maybe there's a time - travel element where Ichigo goes back in time and gathers a harem of historical figures with spiritual powers.
One idea could be that Ichigo has to hide his vampire nature from his friends at first. He struggles with the new instincts and powers, like enhanced speed and strength. Maybe he has to resist the urge to drink blood from his loved ones.
One idea could be that Ichigo arrives in the Fairy Tail world and his powerful spiritual energy is mistaken for a new type of magic. He could join forces with Natsu and the gang to fight against a common enemy that threatens both his world and the Fairy Tail world. Another could be that Ichigo's zanpakuto has some sort of unique interaction with the Fairy Tail magic, like being able to absorb or nullify certain spells.