In a medium bowl, combine mango cubes, mandarin orange sections, kiwi slices, marshmallows, and yogurt. Cover and chill for 2 to 4 hours.
To serve, cut each banana half crosswise into two pieces. Line 6 banana-split or dessert dishes with the banana pieces. Stir half of the coconut into mango mixture. Spoon mango mixture into dishes. Sprinkle each serving with remaining coconut. If desired, drizzle with honey and garnish with a star fruit. Makes 6 servings.