Wash and dice the mixed fruit into bite-sized pieces. Set aside.

In a small saucepan, combine the coconut water and agar agar powder. Let the mixture sit for 5 minutes to hydrate.

Place the saucepan over medium heat and bring to a gentle simmer, stirring constantly, until the agar agar is fully dissolved, about 3 to 5 minutes.

Stir in the agave syrup and fresh lime juice. Remove from heat and let the liquid cool slightly for 2 minutes.

Arrange the diced fruit evenly in 6 silicone molds or small glass cups. Pour the warm agar liquid over the fruit, filling each mold to the top.

Refrigerate for at least 1 hour, or until the jelly is fully set and glossy. Unmold carefully and garnish with fresh mint leaves before serving.