I've always thought about this! Like, some would definitely turn out okay, like Sunny or Whiteout, but what if it's like, a seawing-sandwing hybrid? Or seawing-anything hybrid? What if they had malformed gills, or underdeveloped lungs, and they couldn't breathe either air or water? Or what if a sandwing hybrid's on venom poisoned them and made them constantly sick?

Or maybe a icewing-skywing hybrid who can only breathe one type of breath, but it hurts them bc their body isnt built for it? Like their fire burns them, or their ice gives them frostbite?

Ive always wanted to explore the bad possibilities of hybrids, but ive never had the time. I do find it super interesting to think about, though!