Yes, there are likely fanfictions about Ichigo fighting Ulquiorra that are popular. 'Bleach' has a huge fan base, and the fight between Ichigo and Ulquiorra was a very significant moment in the series. Fans often create fanfictions based on such iconic battles, exploring different scenarios, character emotions, and outcomes that might not have been shown in the original anime or manga.
Shiroichi made his first appearance in the 168th episode of Death. During the battle between Ruki and Shiroya, he broke out of Ruki's body and attacked Ichigo.
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Rukia could be one. Since she has a close relationship with Ichigo, she might be shown cheering him on or even having some sort of role in the fight. Uryu could also be highlighted. He's a powerful Quincy and might have some unique insights or actions during the fight. Orihime, with her healing and shield - like abilities, could potentially play a role in protecting Ichigo or the others during the battle.
The main appeal is likely the expansion of the 'Bleach' universe. The fight between Ichigo and Ulquiorra was a key moment. In this fanfiction concept, with everyone watching, it can show the significance of the fight on a larger scale. It can also be used to develop minor characters who are just spectators in this scenario. Their reactions, thoughts, and any actions they might take because of the fight can make for an interesting read and add more complexity to the 'Bleach' world.
One possible fanfiction could focus on Ichigo's journey as the first male Shinigami. It might explore how he initially discovers his powers and the challenges he faces in a world dominated by female Shinigami. He could struggle with acceptance from the existing Shinigami community and have to prove himself time and again.
One interesting aspect could be the unique interpretations of Ichigo's powers during the fight. Writers might come up with new ways for him to use his Bankai or Hollow forms, which adds an exciting twist to the well - known battle. Another aspect is the character development. In fanfiction, side characters might have more in - depth roles in this fight, showing different perspectives on the conflict between Ichigo and Aizen.
Many of the captains would be on the edge of their seats. They'd be closely observing every move Ichigo makes. Ukitake might be silently cheering Ichigo on, hoping that he can succeed where they might have failed in the past against Aizen. And Hitsugaya would probably be analyzing Ichigo's techniques to see how he can improve his own skills.
One possibility is that the captains start to question their own beliefs and power levels. Ichigo, being a substitute Soul Reaper, is taking on Aizen, a very powerful foe. This could make the captains realize that there are other ways to gain strength beyond the traditional Soul Reaper training. They might also start to see Ichigo as a potential ally in future battles against greater threats.
I have no idea who the author of the 'first to fight novel' is. There are so many novels out there, and without more information, it's impossible to determine the author.