One possible motive could be fear. Ichigo is extremely powerful, and they might fear that he could one day turn against the Soul Society. So, to prevent any potential future threat, they order his death.
Maybe it's a matter of politics. There could be factions within the Central 46 that see Ichigo as an obstacle to their plans. For instance, if there are groups within the Soul Society that want to change the current power structure and Ichigo is seen as a symbol of the old or new order, depending on how you look at it, they would want him out of the way.
Another motive could be misinformation. The Central 46 might have been fed false information about Ichigo. They could think that he has committed some heinous crime against the Soul Society when in fact he's innocent. This would lead them to order his death based on false pretenses.
I'm not sure which specific 'Central 46 Orders Ichigo's Death' fan fiction you are referring to. There could be many different interpretations and stories out there. It might be a very dark and alternative take on the Bleach universe where the Central 46, which is an important governing body in the series, orders Ichigo's death for some reason. Maybe it's because they see him as a threat to their power or their view of how the Soul Society should be maintained.
Aizen might be motivated by power. Ichigo has a very unique power set that Aizen may want to harness for himself. And Rukia, being from Soul Society, could be used as a way to gain information or leverage against Soul Society.
It could lead to some really interesting plot twists. Ichigo's powers and nature might interact with the Espada's dynamics in unexpected ways, creating a whole new story arc.
Maybe he wants to use Ichigo as a bargaining chip. If there are other forces or characters in the fanfiction world that Kisshu is in conflict with, he could kidnap Ichigo to gain an advantage over them. For example, if there are rival groups vying for power or resources, Ichigo might be valuable to them in some way, and Kisshu could use her to negotiate. Another motive could be that he believes Ichigo has some sort of special power or knowledge that he wants to extract from her, and kidnapping is his way of getting close enough to do so.
In Death, Ichigo Amagasaki's dual blade form was one of the more important forms. In the Thousand Year Blood War chapter, Moon Slaying was broken by Uhabah. With the help of the Zero Division, Moon Slaying Blade was recovered. Without the suppression of Uhabah's power, the true form of Moon Slaying Blade was Dual Blade Moon Slaying. The long blade represented the power of the Death God, and the short blade represented the power of the Annihilator. Moreover, in the third season of the Death God's Thousand Year Blood War anime, chapter 28, Ichigo's sword turned into a dual-blade mode and fought with Tomohabah. This form could be considered a manifestation of Ichigo Amagasaki's fusion of the powers of the Grim Reaper, Extermination Master, and many others. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Ichigo Amagasaki's Reaper form was recorded in the following episodes: The first time he transformed into the Reaper form was at the beginning of the episode;19 episodes had a related form; he also appeared in the Reaper form in episodes such as the battle with Shiraya (59 episodes), the battle with Grimjo (140 episodes, etc.), the battle with Tanuku (82 episodes), and the final battle with Kariya (108 episodes). In episodes such as the Thousand Year Blood War, there would also be the appearance of the Death God. In episodes 165 - 167, when he fought with Grimjo again, he would also appear in the Death God's form and finally defeat the opponent. In addition, in the battle against Urchiola and other plots, there would also be the appearance of the Death God. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
It could lead to a significant power boost for Ichigo and change the course of the story in exciting ways.
One interesting aspect is the exploration of different character relationships. In fan fiction, we can see new interactions between the cute characters of Ichigo Mashimaro that might not be fully explored in the original work. For example, their daily adventures could be elaborated in unique ways, like going on a special picnic or having a small party at home.
Power growth is a common theme. Since Ichigo has two zanpakuto, fan fictions often focus on how he becomes more powerful. For example, he might learn new techniques.
It depends. On one hand, it can be a way for people to express their thoughts and feelings about the Harambe incident in a creative way. But on the other hand, some might find it disrespectful to Harambe's memory as his death was a real and tragic event. So it's a matter of personal opinion.