Lightly coat four 6-ounce custard cups with vegetable spray; set aside. Place the water in a small nonmetal bowl and sprinkle in the gelatin; set aside. Place the tofu, banana, honey, and lemon juice in the bowl of a food processor or blender; puree until smooth. Place the bowl containing the gelatin in a microwave and cook for 30 seconds; stir until dissolved. Add to the banana puree and pulse to combine. Pour into the custard cups. Chill until set, about 1 1/2 hours. Place the chocolate chips in the bowl of a food processor or blender and pulse to chop. In a small saucepan, bring the soy milk to a boil. Pour the hot soy milk over the chocolate and pulse until smooth. Using a paring knife, loosen the edge of each pudding from its cup. Unmold into bowls. Drizzle some warm chocolate sauce over each pudding.