The appeal lies in the fact that these characters come from a rich and beloved universe like Bleach. Fans are already invested in them. Aizen's devious nature, Ichigo's growth journey, Rukia's grace, and Aslem (assuming it's an OC or a less - known character) can bring new flavors. The fanfic gives a chance to see them in new settings, facing new challenges, and interacting in ways that can either be in - line with the original themes or completely break the mold, all of which are exciting for fans.
The combination of these characters. Aizen is a complex and powerful villain, Ichigo is the determined hero, and Rukia has her own unique charm. When you add Aslem into the mix, there are so many possibilities for different storylines. It could be about power struggles, or about forging new alliances, which is very appealing.
I'm not sure which specific one to recommend off - hand, but you can try looking on fanfiction.net. There are likely many 'Aizen Aslem Ichigo Rukia fanfic' there. You can search by tags like 'character relationships' or 'action - adventure' to find ones that might interest you.
One of the things that can make it interesting is the exploration of different character arcs. Aizen's obsession can be a catalyst for Ichigo and Rukia to grow in ways they might not have in the original story. It can also bring out different sides of their personalities. For example, Ichigo might become more determined to protect Rukia from Aizen, showing a deeper level of his loyalty. Rukia, on the other hand, could develop new strategies to deal with Aizen's threat, highlighting her intelligence and resourcefulness. Additionally, the fanfic could introduce new settings or concepts related to Aizen's obsession, such as alternate dimensions or new forms of power, which can keep readers engaged.
The appeal lies in the contrast of their characters. Ichigo as an arrancar has a different, more edgy side compared to his normal self, and Rukia's strong - willed nature creates an interesting dynamic. Their interactions can be filled with tension and a sense of the unknown, which is exciting.
The chemistry between Ichigo and Rukia in the original series. Fans love to see that relationship explored further in fanfiction, especially with a kiss which is a very intimate moment.
One idea could be that Aizen kidnaps them to use Ichigo's power and Rukia's knowledge of Soul Society for his own dark plans. He might want to study Ichigo's unique Hollow - Shinigami powers up close and use Rukia as a bargaining chip with Soul Society.
Their relationship is appealing because it's a relationship of equals. In the Bleach universe, they both have their own strengths and weaknesses. In fanfiction, this equality can be explored in different ways, like how they support each other during battles or in emotional times.
The potential for different storylines is a big factor. In the anime/manga, their relationship was left with some room for interpretation. Fanfiction writers can take this and create all kinds of scenarios, like alternate universes where they are from different social classes or have different powers. This allows for a lot of creativity and exploration of their characters.
The appeal lies in the characters themselves. Ichigo and Rukia have a very unique dynamic in the original series. Fanfiction writers can expand on that, showing a deeper emotional connection that could lead to love. It gives fans a chance to see their favorite characters in a new romantic light.
In fanfiction, their love is appealing because of their shared journey. They've been through so many battles together in the 'Bleach' series. This shared history forms a deep bond that writers can explore in different and romantic ways. Also, their personalities are complementary. Rukia's calm and collected nature against Ichigo's impulsive and passionate one makes for a great romantic pairing in fanfictions.
The combination of the werewolf element with the existing characters of Ichigo and Rukia is really interesting. It adds a new layer of mystery and danger. The werewolf Ichigo could have new powers and instincts that interact in unique ways with Rukia's abilities and personality.