In a small bowl or measuring cup, whisk together the marinade: coconut aminos, rice vinegar or lime juice, avocado oil, toasted sesame oil, fish sauce, garlic powder, and sriracha (if using).
Place the chicken thighs in a zip-top bag, bowl, or sealable container and pour in the marinade. Seal and move the chicken around until each piece is evenly coated.
Marinate for at least 15 minutes, or ideally several hours up to 24 hours in the refrigerator.
Preheat the air fryer to 375°F for 3 to 5 minutes. If desired, lightly spray the basket with cooking spray to prevent sticking.
Arrange the marinated thighs in a single layer in the air fryer basket, rounded side up, making sure they do not overlap. Depending on your air fryer size, you may need two batches.
Air fry at 375°F for 14 minutes.
Flip the thighs and air fry for an additional 4 to 6 minutes, until the outside is crispy and the internal temperature reaches 165°F.
Remove the chicken from the air fryer and let rest briefly before serving.