Preheat the air fryer to 400°F if the manufacturer’s instructions call for preheating. Place a wonton wrapper on a flat surface. Put ½ teaspoon marinara sauce, 1 mozzarella pearl, and 1 pepperoni slice in the center, keeping the edges clean.
Moisten the wrapper edges lightly with water.
Roll from one corner around the filling.
Fold the side corners toward the center and press the seams firmly closed. Repeat to make 12 rolls.
Arrange the rolls seam-side down in a single layer in the air-fryer basket, leaving space between them and working in batches if needed. Lightly coat them with cooking spray. Air fry at 400°F for about 6 minutes, checking early, until the wrappers are golden and crisp and the cheese is melted. Air fryers vary, so add time only as needed.
While the rolls cook, stir together the melted light butter, minced garlic, parsley, and salt.
Brush or gently toss the hot rolls with the garlic-parsley butter. Let the filling cool for 1–2 minutes before serving.