Prepare the brown rice according to package instructions and set aside to cool slightly.
Using a sharp knife, cut the sushi-grade ahi tuna into 1/2-inch uniform cubes.
In a medium glass bowl, whisk together the coconut aminos, toasted sesame oil, and grated fresh ginger.
Add the tuna cubes to the marinade, tossing gently to coat, and let sit in the refrigerator for 10 minutes.
In a separate small bowl, combine the diced mango, diced pineapple, minced red onion, chopped cilantro, lime juice, and sea salt to create the tropical salsa.
Assemble the bowl by placing the brown rice at the base, followed by the marinated tuna, shelled edamame, sliced cucumber, and sliced avocado.
Top the bowl with the tropical salsa and garnish with black sesame seeds before serving.