Combine mango, pineapple, and red bell pepper in a medium bowl; set aside.
Grate 1 teaspoon rind from orange; set aside. Peel orange, and cut out sections over a small bowl; squeeze membranes to extract juice. Reserve 2 tablespoons juice. Discard remaining juice and membranes. Add reserved orange rind and sections to mango mixture. Add jalapeño pepper, reserved orange juice, and sugar; toss gently. Let stand 10 minutes.