The world of fanfiction can feel overwhelmingly vast sometimes, but narrowing down a specific niche like 'alien predator with strong human protagonists' actually points you toward some surprisingly focused communities. Your most direct route would be to head over to Archive of Our Own—Ao3 for short—and use its incredibly granular tagging system. Try searching for the 'Predator' fandom tag, then combine it with tags like 'Human Strength', 'Competent Humans', 'Human vs. Yautja', or even 'Badass Human'. Many writers there explore dynamics where humans aren't just prey, but formidable adversaries or even uneasy allies. The 'Aliens vs. Predator' fandom tag also often yields crossover stories where Colonial Marines or survivors from the 'Alien' universe hold their own.
Don't overlook some dedicated forums, either. Sites like SpaceBattles or Sufficient Velocity have Creative Writing sections where sci-fi enthusiasts love to pit humans against technically superior alien hunters, often focusing on tactical ingenuity and sheer grit. These stories sometimes lean into a 'rational fiction' style, which really emphasizes a clever, capable human protagonist outthinking their otherworldly opponent. The vibe is less about shipping and more about survival and strategic combat, which might be exactly what you're after.
You might also find gems on more general fanfiction hubs like FanFiction.net by searching for 'Predator' and then sifting through summaries. The key is to look for descriptors like 'hardened veteran', 'unlikely hunter', or 'fight for dominance' in the summaries. I recently stumbled upon a story where a former special forces operative uses the jungle itself as a weapon against a hunting party, turning the predator's game into a brutal two-way street. That blend of environmental mastery and raw human determination really captures the spirit of what makes these matchups so compelling to read.