In a small saucepan, combine 1 cup of water and sugar. Heat over medium heat until the sugar dissolves completely. Remove from heat.
Sprinkle the unflavored gelatin over the mango juice in a bowl. Let it sit for about 5 minutes to bloom.
After blooming, add the hot water and sugar mixture to the bowl with the gelatin and mango juice. Stir until the gelatin is fully dissolved.
Pour the mixture into a mold or individual serving cups. Refrigerate for at least 4 hours or until set.
In a separate bowl, beat the softened cream cheese, powdered sugar, and vanilla extract until smooth and creamy.
Gently fold in the whipped cream until fully combined.
Once the gelatin is set, remove it from the mold or cups. Top each serving with a generous dollop of the cream cheese mixture.
Garnish with fresh mango slices if desired. Serve immediately.