Gabi remains alive in the manga. The plot doesn't lead to her death. It's one of those character arcs where she continues on despite facing various challenges.
For a more villainous touch, including Voldemort or his followers could create high - stakes situations. Bellatrix Lestrange could be a terrifying adversary for Harry and Gabi. On the other hand, adding new original characters, like a powerful but reclusive wizard who lives in the Forbidden Forest, could also make the story more exciting.
Gabi is still alive in the AOT manga. Her fate was determined by the plot and the author's choices, and death wasn't one of them for her in this particular storyline.
I don't know the author of 'Kaya Woods Graphic Novel'. However, if you search for it on some specialized graphic novel websites or in local libraries, you might be able to find the information. You could also try asking in some graphic novel enthusiast groups on social media.
The concept of the 'best' author is subjective. But a few authors stand out in the 'naruto kaya fanfic' genre. For example, ShurikenStoryteller. Their fanfics often explore new and unique aspects of the Naruto universe with Kaya as a central character. They might introduce new jutsu or explore different relationships. Also, there's CloudAuthor, who is great at creating a vivid and immersive world for Kaya in the Naruto - inspired setting, making their fanfics quite popular among readers.