Chicken Fajita Kebabs

Name: Chicken Fajita Kebabs
Ingredients: 2 tsp lime zest; 3 tbsp fresh lime juice; 3 tbsp orange juice (mandarin or navel); 3 tbsp olive oil, plus more for brushing the grill; 1 tbsp minced garlic (3 cloves); 1 tsp packed brown sugar; 2 tsp chili powder (preferably 1 tsp regular 1 tsp ancho); 2 tsp ground cumin; 2 tsp minced canned chipotle pepper, or more to taste (about 1 pepper); 3 tbsp minced fresh cilantro, plus more for garnish; 1 tsp salt; 3/4 tsp freshly ground black pepper; 1 3/4 lbs boneless skinless chicken breasts, diced into 1 1/4-inch pieces; 1 large yellow onion peeled and diced into 1-inch chunks; 3 bell peppers (preferably 1 red, 1 yellow, 1 green), cored and diced into 1-inch pieces