Grief is a very common theme. Since Ichigo's death is unexpected and early, the other characters are likely to experience deep sorrow. Another theme could be the search for meaning. After his death, the remaining characters may start to question their own lives and what they are fighting for.
One aspect of 'ichigo dies young fanfiction' could be the impact on the overall plot. If Ichigo dies young, it can completely change the direction of the story. Maybe new characters rise to fill the void he left, or existing characters have to take on new roles. It also allows for a different exploration of the themes in the original work, such as the fragility of life and the importance of friendship in the face of loss.
One common theme could be grief. Since Danny dies young, other characters in the fanfiction might have to deal with the intense sorrow of losing him prematurely. Another theme could be the idea of unfulfilled potential. Danny might have had dreams or talents that were cut short, and the story could explore how those around him remember or try to honor that. There could also be themes of regret, like if someone had an argument with Danny before he died and now has to live with that guilt.
A common theme is the exploration of their dual natures. Since Ichigo has his own powers and the female hollow ichigo has her unique hollow characteristics, fanfictions often play with how these two different yet connected aspects interact.
One common theme is the battle between good and evil within Ichigo. His normal self represents the good, while Dark Ichigo represents the more primal and sometimes malevolent side. Another theme is self - discovery. As Ichigo grapples with Dark Ichigo, he often discovers new aspects of his own power and personality.
Grief is a very common theme. When Peter dies, the other characters have to deal with the loss, and this is often explored in great detail. There's a lot of mourning, and sometimes anger at the situation.
Rebuilding is also a theme. After Percy's death, the world around the characters might be in chaos. So, in many fanfictions, they have to work towards rebuilding what was lost, whether it's a physical place or the sense of hope that Percy once brought.
Another theme is the change in relationships. For example, the relationship between the vampires and the werewolves might shift because of Bella's death. In some fanfictions, they come together in a new way to deal with the aftermath.
One common theme is the grief of his friends and Pokémon. They have to deal with the loss of someone who was so important to them.
One common theme is redemption. Snape's death is often seen as the ultimate act of self - sacrifice that redeems all his past wrongdoings. Another theme is unrequited love, especially his love for Lily Potter which is a strong undercurrent in many such fanfictions.
Another theme is friendship. Given that both characters are known for their strong bonds with their friends in their original series, fanfictions like to explore how they would form a friendship with each other. They might start off as rivals and then grow to respect and trust one another over time.