The other male characters might have different reactions. Some might feel sorry for Mocha and try to support her, while others might be more focused on how Tsukune's departure will affect the overall balance of power or the group's dynamic. For example, if there are threats in the Rosario Vampire world, Tsukune's absence could make them more vulnerable, and they would need to adjust their strategies.
Well, if Tsukune leaves Moka in fanfiction, it could be due to various reasons. For example, he might feel that he is endangering Moka by being around her. This could create a whole new set of plot developments. Moka could start to question herself and her relationships. It could also lead to some interesting interactions between other characters in the Rosario Vampire world. They might try to comfort Moka or even try to find Tsukune and bring him back, depending on their relationships with the two.
One possible plot could be that Tsukune leaves Mocha due to a sense of duty. Maybe he realizes he has a greater mission in the world of Rosario Vampire that he can't pursue while being with Mocha. He might leave to protect her from the dangerous elements in his life.
First, know the characters well. Tsukune is a complex character with his own growth arc. Make sure to stay true to his personality. Also, understand the world of Rosario Vampire, like the different monster species and their cultures. Then, come up with an interesting plot. It could be a new adventure for Tsukune or a different take on his relationships.
It could be really exciting. Tsukune with Saiyan powers would be super strong. He might have the ability to transform and his battles would be intense. Maybe he would use his Saiyan strength to protect his friends in the Rosario Vampire world from new and powerful enemies.
Tsukune's vampire form in fanfiction can vary greatly. Some authors might focus on the emotional aspect of him dealing with this new side of himself. He could struggle with the urge to feed on blood, or he might embrace it as a part of his new identity. Additionally, his relationships with other characters, especially Moka, can be significantly affected by his vampire form.
Moka would be devastated. She has a strong bond with Tsukune, and his death would likely send her into a deep state of grief and anger. She might go on a rampage seeking revenge against whoever or whatever caused his death.
Tsukune could fit in as an outsider with unique abilities. His vampire powers would be a contrast to the ice - based powers in the Sub Zero world. He might be initially seen as a threat or a curiosity.
Well, perhaps in fanfiction, their relationship could be more comical. Like, Tsukune accidentally gets involved in Moka's vampire family affairs in a really silly way, and they end up having to deal with the chaos together, which strengthens their bond in an unexpected way.
Tsukune's vampire form in fanfiction is sometimes depicted as a symbol of his evolution. He starts as a normal human in the Rosario Vampire world, and as he transforms into a vampire, he represents a bridge between the human and vampire worlds. Writers use this form to show how he can navigate and change the dynamics between the two species.
A possible fanfiction could focus on a love triangle between Kurumu, Tsukune and another character. Kurumu is deeply in love with Tsukune, but Tsukune is conflicted as he has feelings for Kurumu but also has responsibilities towards others. This would lead to a lot of emotional drama and interesting character interactions.