Whisk sugar, lemon juice, vanilla, and Chinese 5-spice powder; adjust to taste, adding more or less ingredients. Add mangoes and raspberries and toss together.
Just before serving arrange kiwis in a circle on outside edge of each of 4 dessert plates, arrange an inside circle of banana slices overlapping kiwis, leaving a space in center of dessert plate. Spoon macerated raspberries and mangoes in the middle; dust with confectioners' sugar and garnish with mint leaves.