First, study Dabi's character in the original BNHA. Notice his mannerisms, his dialogue style, and his relationships. Then, come up with an interesting plot. It could be about his past, his future, or a 'what - if' scenario. For example, what if he joined the heroes? Next, create engaging characters to interact with Dabi. And don't forget to add some action and emotional depth to keep the readers hooked.
First, decide which universe Dabi will cross over into. Then, research that universe thoroughly. For example, if it's a crossover with 'Attack on Titan', learn about the Titans, the Walls, and the Survey Corps. Next, think about how Dabi's character traits will interact with the new setting. Will his pyrokinetic abilities be a big advantage or a hindrance? After that, come up with a basic plot like Dabi teaming up with Eren to fight a new type of Titan that's resistant to fire.
You can start by looking on fanfiction websites like Archive of Our Own or FanFiction.net. Use their search functions and type in 'naruto dabi'. Read the summaries and reviews of the stories to get an idea of which ones might be good. Also, join Naruto or Dabi fan groups on social media platforms. Fans often share their favorite fanfictions in these groups.
Well, unfortunately, Dabi did meet his end in the manga. It was a heart-wrenching moment for fans. The events leading up to his death were filled with tension and drama.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of 'dabi x hawks fanfic' and you can use the search function to filter by tags, ratings, and more. Another option is FanFiction.net, though AO3 generally has a wider range of content.