In a large bowl, combine the ground chicken, cream cheese, mozzarella, cheddar, scallions, Buffalo sauce, Tony Chachere's, ranch seasoning, garlic powder, and egg. Mix until fully incorporated.
Place one tortilla on a cutting board and spread a thin, even layer of the Buffalo chicken mixture across it. Add another tortilla and repeat, building a stack of 5 to 6 layers. Gently press together.
Place the stack in the refrigerator for 30 to 45 minutes. This makes slicing much easier and helps the layers stay together during cooking.
Cut the stack into strips about 2 inches wide. Stack the strips and carefully insert skewers through the layers, then cut between the skewers to create individual kebabs.
Combine the melted butter, Buffalo sauce, and Tony Chachere's. Mix well.
Preheat the grill to 350-375°F. Place the kebabs over indirect heat, brush with Buffalo butter, and cook 20 to 25 minutes, rotating occasionally, until the chicken reaches 165°F. Move over direct heat for the final few minutes to crisp the edges.
Top with a Buffalo sauce drizzle, ranch drizzle, fresh scallions, and blue cheese crumbles. Serve immediately.