Rukia could be the main character too. As a shinigami, she could be drawn into a strange gaming - like dimension. Her knowledge of the Soul Society and her ice - based zanpakuto powers would be useful in this new and unfamiliar environment. She could also have to deal with her own insecurities and past while trying to navigate through the gaming - inspired challenges.
It could be an ordinary human gamer who suddenly finds themselves as a Hollow in the Bleach world. They would have to adapt quickly, using their gaming instincts to survive.
One idea could be a crossover where the shinigami from Bleach enter the world of a gamer. For example, Ichigo could find himself in a virtual reality game world, and his shinigami powers would work in unexpected ways. Maybe his zanpakuto would have different abilities in the game, like being able to cut through digital barriers.
A new character could be introduced as the main character. For example, a normal human from our world who is a hardcore gamer and suddenly gets transported into the Bleach world. They start with no knowledge of the spiritual world but quickly adapt using their gamer instincts. They could choose to side with different factions in the Bleach world, like the Soul Reapers or the Arrancars, based on what they think will give them the best 'game experience' in terms of leveling up and getting cool powers.
It could be Naruto himself. Imagine Naruto encountering a rogue Shinigami and having to deal with the chaos it brings. He would be the perfect main character as he is always eager to face challenges and protect his friends and the village.
It could be an ordinary gamer who has spent countless hours playing Fate - related games. So when they are transported to the Fate universe, they are the main character.
Sasuke could also be a main character in such a fanfic. Given his quest for power and his complex personality, his encounter with the Shinigami could lead to some really interesting character development. He might be tempted by the Shinigami's power or be forced to make difficult choices that would change his path.
A hardcore gamer who has spent countless hours playing zombie survival games. They would have the skills and knowledge to quickly adapt to the real - world apocalypse situation.
Ichigo could be the main character. He has always been on a journey of self - discovery and growth in the Bleach series. Wishing upon a star could give him an extra boost or a new mission. For example, he might wish to become even stronger to protect his friends and family better. His complex relationships with other characters like Rukia, Orihime, and Uryu would add depth to the fanfiction.
Perhaps it could be a character who is a hybrid of Naruto and Ichigo. He has Naruto's determination and Ichigo's cool - headedness in battle. His unique heritage gives him the ability to use both ninjutsu and zanpakuto skills. This makes him stand out and draw the attention of female characters from both series, making him the main character in this harem - filled fanfiction.
One common theme is self - discovery. The OC shinigami often has to figure out their place in the Soul Society and what their powers really mean. For example, they might discover a hidden aspect of their zanpakuto spirit.