There's a fanfiction called 'Faunus in a New Realm'. In this one, the Faunus from RWBY are integrated into the Final Fantasy XV world in a more political way. It shows how the kingdoms in Final Fantasy XV react to these new beings with different abilities. It's a shorter read but still very engaging as it focuses on the cultural clashes between the two fictional settings.
One great 'Final Fantasy XV RWBY Faunus' fanfiction is 'The Faunus Among Kings'. It combines the unique elements of both universes really well. The story follows a Faunus character who somehow gets transported to the world of Final Fantasy XV. It has an interesting plot where the character has to adapt to the new world while also dealing with the discrimination they faced in their own RWBY world.
I really like the fanfiction 'Final Fantasy XV: Faunus Allies'. It's a longer piece that delves deep into the backstories of the Faunus characters. It imagines a scenario where the heroes of Final Fantasy XV team up with the Faunus from RWBY to fight a common enemy. The author does a great job of portraying the different powers and personalities of both groups.
Chapter 273, "Teaching Celeste A Lesson", is the clearest early answer because it turns Teaching Celeste's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Damon and his team—Daveon, Anaya, Celeste, and Miss Leana—all... and follows through with Celeste might have been strong but Miss Leana was still in a league....
Chapter 26, "Artisans, Nightmares, Fierce Spirits, Gods, Demons", is the clearest early answer because it turns Luo Ming's situation into a concrete plot event. It opens with If a camp has more than one hundred thousand people, what kind of... and closes on Alright, there's no use telling you so much.. The key payoff is that the chapter closes with "Above the Earth-digging Realm is the Cold Resistance Level;
Chapter 190, "You're A Softie", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is The morning sun bathed the town in a soft golden hue as Damien and..., but the pressure keeps building through And the orphanage?" Damien asked with visible interest..
Chapter 393, "Time To Move II", is the clearest early answer because it turns Dean Veyra's situation into a concrete plot event. It opens with ««Just after Dean Veyra vanished»» Dean Veyra vanished in a quiet... and closes on Razor-like talons formed from what used to be fingers.. The key payoff is that the chapter closes with He sighed. "Time to move." Then he vanished into the night., which gives Dean Veyra a stronger narrative position and pushes the power growth onward.
Chapter 305, "The Final Phase I", is the clearest early answer because it turns Wyrmere's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Not just in the arena, but in the crowd itself—no more restless... and follows through with Their weapons locked—muscles trembling, eyes burning..
Chapter 402, "Identify Yourselves!", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, The steady rhythm of Fenrir's paws thudded against the dirt road, the.... By the end, A beast, its once-powerful body rotting with black veins.. Inside the broader technology upgrade storyline, it turns trade and resources's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Lyone.
Chapter 197, "Letter From Ryedale", is the clearest early answer because it turns Daveon's situation into a concrete plot event. The chapter gives readers a real answer by opening on The battle between Daveon and the demon continued with as much... and ending on His second dagger sliced into the demon's neck, cutting deep into the.... In story terms, the chapter closes with General Rhaegor turned away from the others and began walking toward the royal chambers.
Chapter 173, "The Battle In The Cavern", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with The small infirmary Arielle had prepared in Westmont was bustling... and follows through with One more to go," he said quietly, his tone resolute..
Chapter 239, "The Underground Search", is the clearest early answer because it turns Aquila's situation into a concrete plot event. It opens with The massive cobra hissed violently, its red eyes locking onto Aquila... and closes on His boots echoed lightly against the wooden floor as he retraced his.... The key payoff is that the chapter closes with I am still recovering but you all matter to me too!! Thank you guys!!
Chapter 359, "Dealing With Merging Demons", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter turns that into something concrete by moving from Damien's feet slammed into the earth like a warhammer crashing from... to Wind Vortex Guard!" A spinning magic shield wrapped around him..