The JJBA manga is indeed finished. It had a great journey and wrapped up with a satisfying conclusion for fans. However, there's always the possibility of spin-offs or related works in the future.
As a person who loves reading novels, my knowledge is limited to the year 2021. However, according to what I know, the author of " Choosing the Heavens " ended in 2017. If you have any other questions, please feel free to ask me.
The determination of whether the novel 'Dio' is canon can be complex. It might involve factors like consistency with established lore, authorial intent, and the response from the fan community. Without specific details, it's hard to give a definite answer.
One idea could be that Kira Yoshikage from JJBA somehow ends up in the Naruto world. Maybe his Stand ability could be misinterpreted as some kind of strange ninja jutsu. He might try to live his quiet life there, but his actions would surely draw the attention of the ninja. For example, if he starts using his Stand to kill people in the ninja villages, it would be like a new and unknown threat to the ninja, and they would have to figure out how to deal with it.
Character development is key in a good dio crossover fanfiction. If Dio is in a crossover with the Final Fantasy world, we should see how he changes or adapts to the new environment. The pacing also matters. It shouldn't be too rushed, like suddenly having Dio defeat all the main characters in one chapter without a proper build - up. The world - building should be detailed. If it's a crossover with the Warhammer 40K universe, the writer needs to accurately describe the grimdark setting and how Dio fits into it. Moreover, the dialogue should be engaging, making the interactions between Dio and the new characters believable.